The best fish oil supplements for pets balance a usable format, clear dosing, and a bottle size that suits your household. I rank Chew + Heal Norwegian Salmon Oil, 32 oz as the best overall starting point for shoppers seeking a large liquid bottle, while Nordic Naturals Omega-3 Pet Fish Oil, 2 oz stands out for buyers who prefer a smaller bottle, and Nutramax Welactin, 16 oz offers another liquid format to compare. The main tradeoffs are liquids versus softgels, bottle size versus freshness after opening, and pet-specific directions versus a product marketed for dogs and cats. No single format fits every pet or feeding routine. Read on for the full comparison and guidance on choosing a product that works for your household.
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Key Takeaways
- Large liquid bottles dominate this lineup: the 32 oz Chew + Heal, Natural Dog Company, and Zesty Paws options suit households that want a larger supply, but bottle size alone does not establish value or dosing suitability.
- Small bottles can make a more practical first purchase: Nordic Naturals’ 2 oz liquid and several 8 oz options reduce the commitment if your pet is new to fish oil or you are unsure how readily it will accept a liquid supplement.
- Softgels offer a different routine, not a universal upgrade: Nutri-Vet and Nordic Naturals provide capsule formats for buyers who want to avoid pouring oil, though pets must accept the capsules and the label must suit their size.
- Brand and fish source do not replace label comparison: salmon oil, salmon-and-pollock oil, and broadly named fish oil products vary in format and directions, so compare the EPA and DHA information and serving guidance on each specific label.
- The best fit depends on the pet and household: this lineup includes products labeled for dogs and cats as well as dog-specific choices, making species directions, serving size, and the ability to give the product consistently more useful than bottle size alone.
| fish oil supplements for pet | Form | Volume | Target species | Active ingredients |
|---|---|---|---|---|
| Chew + Heal Norwegian Salmon O | Liquid oil | 32 fluid ounces | Dogs and cats | — |
| Zesty Paws Salmon Oil for Dogs | Oil | 8.5 fluid ounces | Cats and dogs | Omega-3 fatty acids, including EPA and DHA |
| Natural Dog Company Wild Alask | Liquid | 32 fluid ounces | Dogs | — |
| Nutri-Vet Fish Oil Softgels fo | Softgels | — | Dogs | — |
| Zesty Paws Salmon Oil for Dogs | Oil | 16 fluid ounces | Dogs and cats | Omega-3, EPA, DHA, mixed tocopherols |
| Natural Dog Company Wild Alask | Oil | 16 fluid ounces | Dog | EPA, DHA, omega-3, omega-6 |
| Vital Pet Life Salmon and Poll | Oil | 64 fluid ounces | Cat, dog, ferret, fish, horse | — |
| Native Pet Omega 3 Fish Oil fo | Liquid oil | 8 fluid ounces | — | — |
| Chew + Heal Norwegian Salmon O | Liquid oil | — | Dog | Omega-3 fatty acids and vitamin E |
| HEAPETS Wild Alaskan Salmon Oi | Liquid | 8 fluid ounces | Dogs and cats | Crude fat, omega-3 fatty acids, EPA, DHA |
| Nordic Naturals Omega-3 Fish O | Soft gel | — | Dog | Fish oil (EPA and DHA) |
| Nordic Naturals Omega-3 Fish O | Soft gel | 0.64 ml | Dog, cat | EPA and DHA |
| Nordic Naturals Omega-3 Pet Fi | Liquid | 2 fluid ounces | — | — |
| Zesty Paws Salmon Oil for Dogs | Oil | 946 ml (32 fl oz) | — | Omega-3 fatty acids, including EPA and DHA; tocopherols |
| Nutramax Welactin Omega-3 Fish | Liquid | 16 oz (0.47 liters) | Dog | Omega-3 fatty acids, salmon oil |
More Details on Our Top Picks
Chew + Heal Norwegian Salmon Oil for Dogs and Cats, 32 oz
Chew + Heal’s 32-ounce bottle suits households that want a shared liquid topper for both cats and dogs, with a larger supply than the Zesty Paws 8.5-ounce oil. Its salmon flavor can make meals more appealing, while omega-3 fatty acids and vitamin E are positioned to support skin, coat, joints, and immune function. The main advantage is straightforward: one pourable formula serves multiple pet types without adding capsules to the routine. Compared with the Natural Dog Company Wild Alaskan Salmon Oil, this option is described as all-natural and made in the USA, but the supplied details do not specify EPA or DHA amounts or a pump dispenser. The larger bottle also calls for careful measuring and sensible storage after opening. Skip it if fish allergens are a concern or you need a clearly quantified omega-3 dose.
Pros:- Suitable for both dogs and cats.
- 32-ounce bottle offers more volume than Zesty Paws’ 8.5-ounce option.
- Liquid salmon flavor can be mixed into food and may improve meal appeal.
- Includes omega-3 fatty acids and vitamin E.
Cons:- Fish-derived ingredients may not suit pets with fish allergies or sensitivities.
- Liquid oil needs careful measuring, and no pump is specified.
- The supplied product details do not quantify EPA or DHA.
Best for: Households with both cats and dogs that want a large shared bottle of liquid salmon oil to mix into meals.
Not ideal for: Pet owners who need stated EPA/DHA amounts, prefer softgels, or have pets with fish sensitivities.
- Brand:Chew + Heal Labs
- Volume:32 fluid ounces
- Form:Liquid oil
- Flavor:Salmon
- Target species:Dogs and cats
- Key ingredients:Omega-3 fatty acids, vitamin E
- Origin:Made in USA
Our verdict“Choose this large bottle for a multi-pet household comfortable measuring liquid oil and not reliant on a stated EPA/DHA dose.”
Zesty Paws Salmon Oil for Dogs and Cats, 8.5 fl oz
The 8.5-ounce Zesty Paws bottle is the approachable choice for owners who want to try a liquid fish oil without starting with a larger container. Its blend of wild-caught Alaskan salmon and pollock oils supplies EPA and DHA, and the oil can be mixed into food for cats and dogs of all sizes. That makes it more specific about its omega-3 sources than the Chew + Heal Norwegian Salmon Oil, whose supplied details do not list EPA or DHA amounts. The tradeoff is capacity: households using it for several pets may go through this smaller bottle sooner than the Zesty Paws 16-ounce version. It also requires adding oil to meals, so it is a poor match for pets that refuse altered food or owners who prefer a ready-to-give capsule.
Pros:- Lists EPA and DHA among its omega-3 fatty acids.
- Uses wild-caught Alaskan pollock and salmon oils.
- Suitable for cats and dogs of all sizes.
- Small bottle is a lower-commitment way to try a liquid topper than the 16-ounce Zesty Paws option.
Cons:- Smaller 8.5-ounce volume may be inconvenient for several pets or frequent use.
- Must be mixed into food rather than given as a capsule.
- The supplied details do not state the amount of EPA or DHA per serving.
Best for: Owners of one or two cats or dogs who want to introduce food-mixed oil in a smaller bottle and value listed EPA and DHA.
Not ideal for: Multi-pet households seeking a larger supply, or owners whose pets reject food toppers and need a capsule format.
- Form:Oil
- Volume:8.5 fluid ounces
- Target species:Cats and dogs
- Oil sources:Wild-caught Alaskan pollock and salmon
- Active ingredients:Omega-3 fatty acids, including EPA and DHA
- Other ingredient:Tocopherols
- Manufacturer:Zesty Paws LLC
Our verdict“Pick this smaller Zesty Paws bottle to try an EPA- and DHA-containing food topper before committing to a larger supply.”
Natural Dog Company Wild Alaskan Salmon Oil for Dogs, 32 oz
Natural Dog Company’s 32-ounce oil stands out for a pump and a stated weight-based routine: one pump for dogs up to 25 pounds, two for 26–75 pounds, and three above 75 pounds. That gives dog owners a clearer serving guide than the supplied details for Chew + Heal Norwegian Salmon Oil, which list no pump or weight-based directions. Wild-caught Alaskan salmon and pollock oils provide EPA and DHA, while the pump makes daily food-topping more convenient than free-pouring. The tradeoff is that this product is for dogs only, unlike the cat-and-dog options from Zesty Paws and Chew + Heal. It also calls for regular use, and the supplied data do not give a per-pump EPA or DHA quantity. Buyers wanting a shared household oil or quantified dose should compare alternatives before choosing.
Pros:- Pump dispenser avoids free-pouring and supports routine food mixing.
- Provides different pump directions for three dog weight ranges.
- Contains wild-caught Alaskan salmon and pollock oils with EPA and DHA.
- 32-ounce bottle offers more volume than Zesty Paws’ 8.5-ounce option.
Cons:- Listed for dogs, not cats.
- Daily use is recommended for consistent support.
- The supplied details do not quantify EPA or DHA per pump.
Best for: Dog owners who want a large liquid bottle with a pump and serving directions divided by the dog’s weight.
Not ideal for: Cat owners or people seeking a stated EPA/DHA amount per pump or a supplement that can be given less regularly.
- Form:Liquid
- Volume:32 fluid ounces
- Target species:Dogs
- Oil ingredients:Wild-caught Alaskan salmon and pollock oils
- Key nutrients:EPA and DHA omega-3 fatty acids
- Dispensing:Pump
- Dosage:1 pump up to 25 lb; 2 pumps at 26–75 lb; 3 pumps above 75 lb
- Origin verification:Orivo verified
Our verdict“Choose this if your dog benefits from a pump-dispensed topper and you want serving directions tied to weight.”
Nutri-Vet Fish Oil Softgels for Dogs, Omega-3 Skin and Coat Support, 100 Count
Nutri-Vet’s softgels are the lineup’s clearest alternative to liquid toppers: they can be given as a treat or with a meal, so there is no oil to measure or pour. Each softgel provides 300 mg of omega-3 fatty acids, including EPA and DHA, alongside vitamins A, D, and E. That defined omega-3 amount is more explicit than the supplied details for the liquid Chew + Heal Norwegian Salmon Oil and the Zesty Paws 16-ounce oil. The tradeoff is a narrower fit: this product is listed for large dog breeds, not cats, and seafood flavor may put off some dogs. Its vitamin combination also differs from the simpler food-topper approach of the other picks, so buyers should check suitability with their veterinarian, especially if their dog already receives vitamin supplements.
Pros:- Provides 300 mg of omega-3 fatty acids per softgel, including EPA and DHA.
- Softgels can be given as a treat or with meals, with no liquid measuring.
- Includes vitamins A, D, and E.
- Veterinarian-formulated and made in the USA.
Cons:- Listed for large dog breeds, limiting its fit for smaller dogs.
- Seafood flavor may not appeal to every dog.
- Does not offer the cat-and-dog flexibility of the liquid Zesty Paws and Chew + Heal oils.
Best for: Owners of large dogs who want a measured softgel serving instead of adding liquid oil to meals.
Not ideal for: Cat owners, owners of small dogs seeking a clearly suitable serving, or dogs that refuse seafood-flavored softgels.
- Form:Softgels
- Count:100
- Omega-3 fatty acids:300 mg
- Additional nutrients:Vitamins A, D, and E
- Target species:Dogs
- Listed dog size:Large breeds
- Flavor:Seafood
- Made in:USA
Our verdict“Choose Nutri-Vet for a measured, no-pour omega-3 option when you have a large dog that accepts softgels.”
Zesty Paws Salmon Oil for Dogs & Cats – Omega-3, 16 oz
Zesty Paws’ 16-ounce bottle hits a middle ground for homes that want a food topper for both cats and dogs but need more capacity than the 8.5-ounce Zesty Paws version. Its listed EPA and DHA, along with other omega-3 ingredients, make it a practical liquid option for owners focused on skin and coat support without capsules. The product is sourced from Alaskan Bering Sea salmon and carries NASC certification, details that distinguish it from the supplied description of Chew + Heal Norwegian Salmon Oil, which does not list a certification. Compared with the 32-ounce Natural Dog Company oil, this bottle is more suitable for a smaller household and includes cats, though it lacks the other product’s specified weight-based pump directions. Dispensing liquid can still be messy, and the supplied data give no EPA/DHA amount per serving.
Pros:- Suitable for both dogs and cats.
- 16-ounce volume sits between Zesty Paws’ 8.5-ounce bottle and larger 32-ounce options.
- Lists EPA and DHA among its active ingredients.
- Sourced from Alaskan Bering Sea salmon and NASC certified.
Cons:- Liquid can be messy to dispense.
- The supplied details do not specify EPA or DHA per serving.
- No weight-based pump directions are provided in the supplied product data.
Best for: One- or two-pet households with cats, dogs, or both that want a certified liquid topper in a mid-size bottle.
Not ideal for: Owners who need a stated EPA/DHA dose, want weight-based serving instructions, or prefer softgels over pourable oil.
- Form:Oil
- Volume:16 fluid ounces
- Target species:Dogs and cats
- Source:Alaskan Bering Sea salmon
- Active ingredients:Omega-3, EPA, DHA, mixed tocopherols
- Quality certification:NASC certified
- Model:Salmon Oil 16oz Pump
Our verdict“Choose this mid-size Zesty Paws oil for a cat-and-dog household that wants a certified topper without the larger 32-ounce format.”
Natural Dog Company Wild Alaskan Salmon Oil for Dogs, 16 oz
I’d choose this 16-ounce dog-only bottle for owners who want a clear pump routine without buying a large-format jug. Its stated dose changes by dog weight—one pump up to 25 pounds, two for 26–75 pounds, and three above 75 pounds—so the serving guidance is more actionable than Vital Pet Life’s 64-ounce bottle, whose supplied details omit dosage instructions. The blend combines wild-caught Alaskan salmon and pollock oils, and ORIVO verifies species and origin, giving buyers sourcing information alongside EPA and DHA. The pump makes meal-topping simple, but this is still a daily liquid supplement, and the weight brackets may not suit owners seeking a cat-compatible product. Compared with Native Pet’s 8-ounce dog-and-cat option, this bottle offers twice the volume but is limited to dogs.
Pros:- Provides EPA and DHA from salmon and pollock oils.
- ORIVO verification covers species and origin.
- Pump dispenser and weight-based directions simplify routine serving.
- Supports skin, coat, joints, heart, and immune health.
Cons:- Designed for dogs, so it is less versatile than Native Pet’s dog-and-cat formula.
- Requires consistent daily use as a liquid food topper.
- The three weight brackets may not provide fine-grained serving guidance for every dog.
Best for: Dog owners who want a pump-top fish oil with explicit weight-based serving guidance and verified sourcing.
Not ideal for: Households seeking one oil for both cats and dogs, or owners who prefer a supplement that does not require daily meal mixing.
- Form:Oil
- Volume:16 fluid ounces
- Oil sources:Wild Alaskan salmon and pollock
- Active ingredients:EPA, DHA, omega-3, omega-6
- Target species:Dog
- Dose for dogs up to 25 lb:1 pump
- Dose for dogs 26–75 lb:2 pumps
- Dose for dogs over 75 lb:3 pumps
- Included component:Bottle with pump
Our verdict“Pick this for a dog-focused oil with clear weight-based pump directions; choose Native Pet if you need a dog-and-cat option.”
Vital Pet Life Salmon and Pollock Fish Oil for Pets, 64 fl oz
Multi-species flexibility is the reason I’d place this 64-ounce bottle in a different lane from the dog-focused Natural Dog Company oil. It is listed for cats, dogs, ferrets, fish, horses, and other small animals, while its salmon-and-pollock blend supplies EPA and DHA for skin, coat, normal shedding, immune function, and heart support. The large bottle makes more sense for a household with several eligible animals than Native Pet’s 8-ounce pump bottle, which is sized for a typical dog’s roughly 30-day supply. The tradeoff is less guidance in the supplied product details: no dosage instructions are provided, and broad species suitability does not tell an owner how much to serve each animal. NASC certification and ORIVO verification add quality and sourcing checks, but owners should confirm species-specific use and serving amounts.
Pros:- Large 64-fluid-ounce format suits households using fish oil for several animals.
- Listed for cats, dogs, ferrets, fish, horses, and other small animals.
- Salmon and pollock oils provide EPA and DHA.
- NASC certified and independently verified by ORIVO.
Cons:- The supplied details do not include dosage instructions.
- Broad species coverage leaves owners to confirm suitability and serving amounts for each animal.
- The large bottle may be impractical for a single-pet household.
Best for: Households with multiple pets across listed species that can confirm suitable serving directions with a veterinarian or product label.
Not ideal for: Owners who need clear dosage instructions in the supplied information, or those buying for a single small pet who would rather handle a smaller bottle.
- Form:Oil
- Volume:64 fluid ounces
- Item weight:4.1 lb
- Oil sources:Salmon oil and pollock oil
- Target species:Cat, dog, ferret, fish, horse
- Dog breed size:All sizes
- Certification:NASC certified
- Independent verification:ORIVO
Our verdict“Choose this large, multi-species bottle for a varied-pet household only if you can confirm appropriate serving guidance.”
Native Pet Omega 3 Fish Oil for Dogs and Cats, 8 oz
For someone starting with fish oil, I’d favor Native Pet’s compact 8-ounce pump bottle over Vital Pet Life’s 64-ounce format: the listed supply is about 30 days for a typical dog, making it easier to start with a smaller commitment. It is made for both dogs and cats and pairs wild-caught salmon and pollock oils with no fillers and non-GMO ingredients. The pump helps turn it into a simple food topper, while the stated focus on skin, coat, joint comfort, and heart health gives buyers a clear sense of its intended use. The tradeoff is refill frequency: Natural Dog Company’s 16-ounce bottle holds twice as much and supplies explicit dog weight-based dosing, which Native Pet’s supplied details do not provide. Veterinary advice is recommended before use for puppies or nursing pets.
Pros:- Suitable for both dogs and cats.
- Combines wild-caught salmon and pollock oils.
- Made without fillers and with non-GMO ingredients.
- Pump bottle makes serving over food convenient.
Cons:- The listed supply is about 30 days for a typical dog, so refills may be frequent.
- Supplied details do not include specific weight-based serving amounts.
- Veterinary consultation is advised before use for puppies or nursing pets.
Best for: First-time fish-oil buyers with a dog or cat who want a smaller pump bottle and a formula without fillers.
Not ideal for: Owners of large dogs or multiple pets who want a longer-lasting bottle, or caregivers seeking supplied weight-based dosing directions.
- Form:Liquid oil
- Volume:8 fluid ounces
- Item weight:8 ounces
- Oil sources:Wild-caught salmon and wild-caught pollock
- Suitable pets:Dogs and cats
- Dog breed size:All sizes
- Typical dog supply:Approximately 30 days
- Included component:8-ounce omega oil with pump
Our verdict“A sensible starter choice for dog-and-cat homes that prefer a small, no-filler pump bottle over a bulk supply.”
Chew + Heal Norwegian Salmon Oil for Dogs, 8 oz
Chew + Heal takes a narrower, dog-only approach than the salmon-and-pollock blends from Natural Dog Company and Native Pet. Its stated formula combines salmon oil’s omega-3 fatty acids with vitamin E, and the 8-ounce liquid can be added to meals for dogs of all sizes. That simplicity may appeal to an owner looking for a basic meal topper rather than a multi-species bottle or a longer list of health-support claims. The tradeoff is thinner product detail: unlike Natural Dog Company, the supplied information gives no pump or weight-based dosing directions, and it does not identify EPA and DHA amounts. It also contains fish, so it is a poor fit for dogs with fish sensitivities. This is a straightforward option, but buyers wanting clearer serving guidance should compare it with Natural Dog Company.
Pros:- Combines omega-3 fatty acids with vitamin E.
- Liquid oil can be added directly to meals.
- Listed as suitable for dogs of all sizes.
- Manufactured in the USA.
Cons:- Contains fish and may not suit dogs with fish sensitivities.
- Supplied details do not give weight-based dosage directions.
- No specific EPA or DHA amounts are stated in the provided information.
Best for: Dog owners seeking a basic salmon-oil meal topper with vitamin E and no need for a multi-pet formula.
Not ideal for: Dogs with fish sensitivities, or owners who want pump dispensing, explicit weight-based directions, or detailed EPA and DHA amounts.
- Form:Liquid oil
- Unit count:8 fluid ounces
- Target species:Dog
- Flavor:Salmon
- Active ingredients:Omega-3 fatty acids and vitamin E
- Allergen information:Fish
- Country of manufacture:USA
- Manufacturer:Chew + Heal
Our verdict“Choose this for a simple dog-only salmon oil with vitamin E, but compare Natural Dog Company if serving guidance matters more.”
HEAPETS Wild Alaskan Salmon Oil for Dogs and Cats, 8 oz
HEAPETS is the pick I’d make for owners who prioritize a shorter list of excluded additives in a dog-and-cat fish oil. The product is described as free from filler oils, soy, corn, wheat, artificial flavors, and synthetic colors, while its EPA- and DHA-containing salmon oil is intended to support skin, coat, immune, brain, joint, and heart health. A pump lets owners mix it into meals, much like Native Pet’s smaller dog-and-cat bottle. Compared with Native Pet, HEAPETS lists a wider set of intended support areas, but the supplied details do not give an approximate supply length or weight-based serving directions. The liquid format also means it must be mixed into food, so it will not suit owners seeking a dry or capsule-style supplement. I’d confirm serving directions before starting.
Pros:- Contains omega-3 fatty acids, including EPA and DHA.
- Made without filler oils, soy, corn, wheat, artificial flavors, or synthetic colors.
- Listed for both dogs and cats of small, medium, and large sizes.
- Pump helps mix the oil into food.
Cons:- Liquid format must be mixed into food.
- Supplied details do not state weight-based serving directions.
- No approximate supply duration is provided.
Best for: Dog-and-cat owners who want a pump-top salmon oil and want to avoid several listed filler oils, grains, and artificial additives.
Not ideal for: Pet owners who prefer capsules or need clear serving amounts and supply duration in the supplied product information.
- Form:Liquid
- Volume:8 fluid ounces
- Target species:Dogs and cats
- Suitable breed sizes:Small, medium, large
- Active ingredients:Crude fat, omega-3 fatty acids, EPA, DHA
- Oil source:Wild Alaskan salmon oil
- Allergen information:Soy free
- Included component:One bottle with pump
Our verdict“Pick HEAPETS if avoiding listed additives is your priority; choose Native Pet if its stated typical-dog supply estimate is more useful.”
Nordic Naturals Omega-3 Fish Oil for Dogs with EPA + DHA – 120 Count
For dog owners who want a measured, no-pour fish oil option, these 120 unflavored soft gels offer a straightforward alternative to liquid bottles such as Zesty Paws Salmon Oil for Dogs and Cats, 32 oz. Each serving supplies 320 mg of omega-3s, including EPA and DHA, and the oil comes from wild-caught fish in triglyceride form. The formula avoids artificial colors, flavors, and preservatives, which keeps the ingredient list appealingly simple. The tradeoff is the delivery method: a capsule may be awkward for a dog that refuses pills, while liquid oil can be mixed into food. This version is also specifically described for dogs, so it is less flexible for households seeking one fish oil product for both cats and dogs.
Pros:- Provides 320 mg of omega-3s per serving, including EPA and DHA.
- Uses wild-caught fish oil in triglyceride form.
- Soft gel format avoids pouring or measuring liquid.
- Made without artificial colors, flavors, or preservatives.
Cons:- Soft gels may be difficult to administer to picky dogs.
- Dog-focused formulation is less versatile than the cat-and-dog options in this lineup.
- The 120-count supply is smaller than the 180-count Nordic Naturals soft gels.
Best for: Dog owners who want a pre-portioned, unflavored soft gel and do not need a large-count bottle.
Not ideal for: Owners of pill-averse dogs or multi-pet households seeking a product explicitly formulated for cats as well.
- Brand:Nordic Naturals
- Target species:Dog
- Form:Soft gel
- Flavor:Unflavored
- Active ingredients:Fish oil (EPA and DHA)
- Omega-3 per serving:320 mg
- Count:120
- Dietary features:Non-GMO, gluten-free, dairy-free
Our verdict“Choose this if your dog accepts capsules and you want a measured soft-gel alternative to liquid oils.”
Nordic Naturals Omega-3 Fish Oil for Dogs, 180 Soft Gels
This 180-count soft-gel bottle suits households that want capsules in a larger supply and a formula listed for both dogs and cats. Like the 120-count Nordic Naturals option, it delivers 320 mg of omega-3s per serving in triglyceride form, with EPA and DHA and no artificial colors, flavors, or preservatives. The longer count is its clearest distinction; it does not offer a higher stated omega-3 amount than its smaller-count sibling. Compared with Nordic Naturals Omega-3 Pet Fish Oil for Dogs and Cats, 2 oz, these gels spare owners from pouring liquid but give up the ease of mixing oil into food. I would favor this for pets that reliably take capsules, not for those that resist them.
Pros:- Includes 180 soft gels, more than the 120-count Nordic Naturals version.
- Listed for dogs and cats.
- Provides 320 mg of omega-3s per serving, including EPA and DHA.
- Uses triglyceride-form fish oil and omits artificial colors, flavors, and preservatives.
Cons:- Capsules can be challenging to give to pets that resist pills.
- The stated omega-3 amount per serving matches the smaller-count version rather than exceeding it.
- Unlike the liquid Nordic Naturals option, it cannot be readily mixed through food.
Best for: Dog-and-cat households whose pets accept soft gels and whose owners want a larger-count bottle.
Not ideal for: Owners who need a food-mixable liquid or have pets that will not take capsules.
- Brand:Nordic Naturals
- Target species:Dog, cat
- Form:Soft gel
- Count:180
- Flavor:Unflavored
- Active ingredients:EPA and DHA
- Omega-3 per serving:320 mg
- Volume:0.64 ml
- Allergen information:Gluten-free
Our verdict“Pick this larger-count capsule option if both your dogs and cats accept soft gels.”
Nordic Naturals Omega-3 Pet Fish Oil for Dogs and Cats, 2 oz
This 2-ounce liquid is the most focused fit here for cats and small-breed dogs: its serving information is expressed as 294 mg of omega-3s per mL, and the product is described for smaller animals. The unflavored oil can be added to food, avoiding the capsule struggle associated with both Nordic Naturals soft-gel products. It also supplies EPA and DHA in triglyceride form and is made without artificial colors, flavors, or preservatives. Compared with Zesty Paws Salmon Oil for Dogs and Cats, 32 oz, this is a much smaller bottle and has a stated omega-3 concentration, while Zesty Paws offers a pump and far more volume. The tradeoff is limited fit: owners of larger dogs may prefer a product designed for broader size needs.
Pros:- Designed for cats and small-breed dogs.
- Provides 294 mg of omega-3s per mL, including EPA and DHA.
- Liquid format can be mixed into food instead of administered as a capsule.
- Uses wild-caught fish oil in triglyceride form and avoids artificial colors, flavors, and preservatives.
Cons:- Small 2-ounce bottle offers less volume than the large pump bottles in this lineup.
- Contains fish, so it may not suit pets with fish sensitivities.
- Its small-animal focus makes it less suitable for owners seeking one option for larger dogs.
Best for: Cat owners and owners of small-breed dogs who want a measured liquid that can be mixed into food.
Not ideal for: Owners of large dogs seeking a larger-volume bottle or a product described for all breed sizes.
- Brand:Nordic Naturals
- Target animals:Cats and dogs
- Recommended dog size:Small breeds
- Form:Liquid
- Flavor:Unflavored
- Omega-3 content:294 mg per mL
- Volume:2 fluid ounces
- Oil source:Wild-caught fish
- Dietary features:Non-GMO, gluten-free, dairy-free
Our verdict“Choose this compact liquid if you are feeding a cat or small dog and want to avoid soft gels.”
Zesty Paws Salmon Oil for Dogs and Cats, 32 oz
With 32 fluid ounces and an included pump, this salmon-and-pollock oil is built for owners who want to add fish oil to meals across a dog’s or cat’s routine. It is listed for all dog breed sizes and supports skin and coat, joints, heart, and immune health. That broad household fit sets it apart from Nordic Naturals Omega-3 Pet Fish Oil for Dogs and Cats, 2 oz, which is a smaller liquid option aimed at cats and small dogs and provides a stated omega-3 amount per mL. Zesty Paws does not provide an omega-3 quantity in the supplied product details, so buyers seeking a specified dose per serving may prefer that Nordic Naturals liquid. The pump simplifies dispensing, but the oil still has to go onto food.
Pros:- Large 32-fluid-ounce bottle suits regular use across multiple pets.
- Included pump makes dispensing easier than pouring from a bottle.
- Listed for cats and dogs, with dogs of all breed sizes included.
- Provides EPA and DHA from salmon and wild-caught Alaskan pollock oil.
Cons:- Product details do not state an omega-3 amount per serving.
- Must be added to food rather than offered as a standalone treat.
- A large bottle may be more than needed for a single small pet.
Best for: Multi-pet households with cats or dogs of different sizes that want a large, pump-dispensed bottle for meal use.
Not ideal for: Owners who need a stated omega-3 amount per serving or whose pets will not eat oil mixed into food.
- Pet type:Cats and dogs
- Form:Oil
- Volume:946 ml (32 fl oz)
- Oil sources:Wild-caught Alaskan pollock and salmon
- Active ingredients:Omega-3 fatty acids, including EPA and DHA; tocopherols
- Dog breed size:All sizes
- Included component:Pump
- Weight:2 lbs
Our verdict“Choose this pump bottle for a multi-pet household that values easy meal-time dispensing over a stated per-serving omega-3 figure.”
Nutramax Welactin Omega-3 Fish Oil Supplement for Dogs, Liquid, 16 oz
Welactin’s 16-ounce liquid is a dog-focused choice for owners who want a simple way to add salmon oil and omega-3s to meals. The included scoop gives a more controlled dispensing method than the pump on Zesty Paws Salmon Oil for Dogs and Cats, 32 oz, though it requires measuring rather than pressing a pump. Welactin is described for dogs of all sizes and life stages, with EPA and DHA supporting skin and coat health. Its product details are narrower than those of Zesty Paws, which is listed for cats as well and names broader support areas; Welactin is specifically for dogs and emphasizes coat and skin. The supplied information does not state an omega-3 amount per serving, so buyers who want that figure should compare it with the Nordic Naturals options.
Pros:- Suitable for dogs of all sizes and life stages.
- Liquid format can be poured over food.
- Includes a scoop for measuring and dispensing.
- Provides salmon oil and omega-3s, including EPA and DHA.
Cons:- Must be measured and added to food rather than given as a standalone treat.
- Product details do not state an omega-3 amount per serving.
- Dog-only target species makes it less flexible than cat-and-dog liquid options.
Best for: Dog owners who want a measured liquid to pour over food and value a product described for all sizes and life stages.
Not ideal for: Cat owners or shoppers who need a stated omega-3 amount per serving before choosing a supplement.
- Brand:Nutramax
- Target species:Dog
- Form:Liquid
- Active ingredients:Omega-3 fatty acids, salmon oil
- Volume:16 oz (0.47 liters)
- Item weight:15.2 ounces
- Unit count:1
- Included component:Scoop
Our verdict“Pick Welactin if you want a scoop-measured liquid for your dog’s meals and do not need a stated omega-3 serving amount.”
How We Picked
I compared the 15 listed products using buyer-focused criteria: format, labeled pet suitability, bottle or count size, and how clearly a buyer can match the directions to a pet. I also considered whether a product’s presentation supports a distinct use case, such as a small trial-size liquid, a larger household bottle, or a softgel routine. I did not treat a large container, a named fish source, or a familiar brand as proof of stronger results; buyers should check the current package for EPA and DHA amounts, ingredients, serving directions, and storage instructions.
The ranking favors products that appear to serve a clear everyday need while leaving room for different feeding preferences. Liquid options lead for buyers who can mix oil into food, while softgels rank as alternatives for those who prefer a measured capsule and have a pet that will take it. Products with multiple bottle sizes are judged by the convenience each size offers, not as separate formulations with assumed differences. These picks are not a substitute for veterinary guidance, especially for pets with health conditions or those taking medication.
| fish oil supplements for pet | Form | Target species |
|---|---|---|
| Chew + Heal Norwegian Salmon O | Liquid oil | Dogs and cats |
| Zesty Paws Salmon Oil for Dogs | Oil | Cats and dogs |
| Natural Dog Company Wild Alask | Liquid | Dogs |
| Nutri-Vet Fish Oil Softgels fo | Softgels | Dogs |
| Zesty Paws Salmon Oil for Dogs | Oil | Dogs and cats |
| Natural Dog Company Wild Alask | Oil | Dog |
| Vital Pet Life Salmon and Poll | Oil | Cat, dog, ferret, fish, horse |
| Native Pet Omega 3 Fish Oil fo | Liquid oil | — |
| Chew + Heal Norwegian Salmon O | Liquid oil | Dog |
| HEAPETS Wild Alaskan Salmon Oi | Liquid | Dogs and cats |
| Nordic Naturals Omega-3 Fish O | Soft gel | Dog |
| Nordic Naturals Omega-3 Fish O | Soft gel | Dog, cat |
| Nordic Naturals Omega-3 Pet Fi | Liquid | — |
| Zesty Paws Salmon Oil for Dogs | Oil | — |
| Nutramax Welactin Omega-3 Fish | Liquid | Dog |
Factors to Consider When Choosing Best Fish Oil Supplements For Pets
Before choosing a bottle, I would match the supplement to the pet, the feeding routine, and the label—not just the product name. These factors can help narrow the field when two options look similar at a glance.
Match the format to how your pet eats
Liquid oils are easiest to mix into food, which can suit pets that eat reliably and tolerate a change in taste or texture. Softgels avoid pouring and can make portioning less messy, but they only help if your pet will swallow them or accept them in food. A common mistake is choosing capsules for convenience without checking whether the pet can take them safely. For a picky eater, start by checking the label and asking your veterinarian whether the product can be given with food or opened. Pick the format you can give consistently rather than the one that sounds simplest on the package.
Compare EPA and DHA, not just the oil name
Salmon oil and fish oil names tell you the general source, but they do not give the full picture of the omega-3 content in a serving. Check whether the label lists EPA and DHA amounts and whether those figures are provided per serving or per measured volume. Avoid comparing products by total oil volume alone; a larger bottle does not automatically mean more EPA and DHA in the amount your pet receives. If the label does not make serving information clear, ask the manufacturer or your veterinarian before choosing. Your veterinarian can also help determine whether a supplement fits your pet’s diet and health needs.
Choose a bottle size you can use while it stays fresh
Large bottles can make sense for multi-pet homes or a routine that uses oil regularly, but they are less convenient if your pet eats only a small amount or may reject the flavor. Once opened, oils need appropriate storage and handling; follow the product’s label rather than assuming every fish oil has the same shelf life. Smaller bottles, such as the 2 oz and 8 oz choices in this lineup, can limit waste while you learn whether your pet accepts the product. Check the use-by date and storage directions before buying a size. The right container is the one your household can finish according to the label.
Check species and serving directions
Dog-and-cat labeling may be convenient in a mixed-pet home, but it does not mean the same serving applies to both animals. Read the directions for each species and weight range, and do not transfer a dog dose to a cat based on bottle size. Some products in this roundup are labeled for dogs only, while others name both dogs and cats. If the label is unclear about your pet’s age, weight, or health status, ask a veterinarian before use. This extra check matters even when the product is sold as a general pet supplement.
Review ingredients, allergens, and handling details
Ingredient lists and storage directions can distinguish products that otherwise seem alike. Check for added flavors or other ingredients your pet may not tolerate, and verify the fish source if your pet has a known sensitivity. For liquids, look for clear instructions on dispensing, refrigeration if required, and how long to use the bottle after opening. For softgels, inspect the capsule ingredients and serving directions rather than assuming the shell is suitable for every pet. If your pet has a history of food reactions, share the full label with your veterinarian before trying a new oil.
Set expectations with your veterinarian
Supplements are not a substitute for diagnosis or treatment, and a fish oil product may not be appropriate for every pet. Talk with your veterinarian before adding one if your pet has a medical condition, takes medication, is pregnant, or already receives omega-3s from food or another supplement. Avoid combining products just because their labels use different wording; the EPA and DHA amounts may overlap. Ask what dose and monitoring plan suit your pet rather than relying on a generic serving suggestion alone. This step helps prevent duplicate supplementation and keeps the choice tied to your pet’s actual needs.
Frequently Asked Questions
Should I choose liquid fish oil or softgels for a pet that refuses supplements?
Neither format is automatically easier for a reluctant pet. A liquid can be mixed into food, but its smell or taste may lead a pet to leave the meal; a softgel may be simple for one animal and impossible for another. Check whether the label allows the capsule to be opened or the oil to be mixed with food before trying either approach. Introduce any new supplement according to your veterinarian’s advice, especially if your pet has a sensitive stomach or a medical condition. If the pet consistently refuses the product, ask your veterinarian about a different format rather than forcing it.
Is a larger bottle always the better choice for a multi-pet household?
A larger bottle can suit a home that uses the same product regularly, but it is not automatically the best fit for multiple pets. Dogs and cats may have different label directions, and the same bottle could last much longer than expected if each pet receives a small serving. Check the storage instructions, use-by date, and how long the product can be used after opening. Compare the label’s EPA and DHA amounts per serving as well as the container size. A smaller bottle may be the safer practical choice if you are still checking whether every pet accepts it.
Can I give my cat a fish oil labeled for dogs?
Do not assume a dog-labeled product is appropriate for a cat just because both animals can consume fish. The species directions, serving amount, and other ingredients may differ across products. This roundup includes options labeled for dogs and cats as well as dog-specific products, so check the exact package rather than relying on a similar product name. Ask your veterinarian before giving a dog-only supplement to a cat or adapting a dog serving. That is especially important if the cat has a health condition or takes medication.
What should I compare when two products both say salmon oil?
Compare the full label rather than the source name alone. Look for EPA and DHA amounts, serving directions, pet species, added ingredients, and storage instructions. A product’s total bottle size does not tell you how much omega-3 a pet receives in one serving. Also check whether directions are based on weight and whether the product is a liquid or softgel, since that changes how you deliver it. If key information is missing or hard to interpret, ask your veterinarian or contact the manufacturer before purchasing.
Should I ask my veterinarian before adding fish oil to my pet’s routine?
Yes, a veterinarian can help determine whether a supplement fits your pet’s diet, health history, and current medications. This is especially helpful for pets with ongoing conditions, pets already receiving omega-3s, and animals with food sensitivities. Bring the specific product label so the veterinarian can review the EPA and DHA content and serving directions. Do not combine fish oil products or increase a serving based only on general advice online. A tailored recommendation can also help you decide whether a liquid or softgel better suits your pet.
Conclusion
For the broadest everyday starting point among these picks, I recommend Chew + Heal Norwegian Salmon Oil, 32 oz as the best overall choice for shoppers who want a large liquid bottle and can use it regularly. For a best value-style fit, compare the larger containers from Natural Dog Company, Zesty Paws, and Vital Pet Life against their current labels and your household’s expected use; the lineup does not establish that one is cheaper per serving. For a premium-minded choice, look closely at the Nordic Naturals options and verify the EPA and DHA details on the package. Beginners may prefer a smaller bottle, such as Nordic Naturals’ 2 oz liquid or an 8 oz option, before committing to a large supply. For pets that resist liquid oil, consider Nutri-Vet or Nordic Naturals softgels only if the pet can take capsules and the label matches its needs. Whichever option you choose, follow the package directions and ask your veterinarian about suitability for your pet.
