Fish Oil for Dogs

Lauren Mick, LVT
By

Lauren Mick, LVT

. Reviewed by Barri J. Morrison, DVM
Updated Jun. 23, 2025
brown and white jack russell terrier dog with a chew toy

Adobe Stock/Evrymmnt

Supplements have become very popular in the canine world, but which ones should you look for when seeking the best health for your dog?   

Fish oil for dogs can have many great benefits, and for this reason many pet parents have started adding it to their pet's daily meals.  

So how exactly does fish oil for dogs work? And how can you determine the best fish oil for your dog?  

Key Takeaways

  • Fish oil provides anti-inflammatory omega-3s (EPA & DHA) that can help to support skin, joint, heart, kidney, and brain health in dogs.
  • Fish oil products for dogs are available in liquid, capsule, or chew form. Always work with your vet to determine the best option for your pup.
  • When giving your dog fish oil make sure to follow all instructions on the manufacturer packaging. Dosage will depend on the product and your specific pet.

What Is Fish Oil for Dogs?

Fish oil is a supplement derived from cold-water fish such as salmon. Fish oils are beneficial for their anti-inflammatory effects and positive effects on boosting the immune system.  

Fish oil is also potentially helpful in reducing tumor growth in certain cancers as well as improving cognitive function in senior dogs.  

Fish oil is rich in omega-3 fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). EPA and DHA act as anti-inflammatory agents and may help address different conditions in dogs including: 

Is Fish Oil Good for Dogs?

Fish oil is used widely in cats and dogs, as well as horses. The supplement has continued to grow in popularity with dog parents because it’s readily available and easy to use.  

There are many fish oil benefits for dogs, including heart protection, keeping skin healthy, and helping with joint lubrication for pups with arthritis. 

Protects the Heart 

Fish oil has been found to reduce the heart’s vulnerability in developing an irregular rhythm, called atrial fibrillation. Additionally, fish oil may act as an anticoagulant and prevent blood clots from forming in dogs with heart disease. 

Relieves Dry, Flaky Skin 

Giving fish oil to dogs with allergies may help to reduce the overall itching caused by triggering irritants. Fish oil works by decreasing a pet’s production of potent stimulators of inflammation, called cytokines. 

Slows the Progression of Kidney Disease 

In failing kidneys, fish oil may lower elevated blood pressure, decrease undesired protein loss in urine, and reduce the production of pro-inflammatory substances that aggravate the kidneys. 

Aids Arthritic Joints 

Fish oil decreases the production of potent lipids that cause inflammation in the joints. Studies show that when fish oil is given to arthritic dogs and cats, these animals tend to be more comfortable and agile than those not supplemented. 

Improves Cognitive Function 

A 2012 study found that supplementing puppies with DHA increased their ability to learn and retain certain skills when compared to puppies not receiving additional DHA. 

Senior pets with cognitive dysfunction had improved recognition of family members and other dogs when supplemented with fish oil. 

Lowers Blood Triglyceride Levels 

Supplementing pets with fish oil may decrease harmful levels of triglyceride, a type of fat found in blood. This is especially critical in pets that have heart disease, pancreatitis, and inflammatory bowel disease. 

Best Fish Oil Products for Dogs

To find the best fish oil product for your dog, it’s important to work with your vet. There are many different dog fish oil products on the market including liquids, capsules, and chewable options. 

Depending on your dog’s health and their age, your vet can help you determine what fish oil product makes sense for your pup. 

It’s also important to do your research on dog fish oil products and what they can benefit, especially if you are looking for a specific health goal for your dog. 

Some common vet recommended fish oil products for dogs include: 

Some allergy supplements also contain fish oil, including Vibeful Allergy and Immune Support Soft Chews

How To Give Dogs Fish Oil

A well-balanced dog food is likely to contain animal fats, which are high in omega-6 fatty acids and can contain some omega-3s.  

But omega-3s can be expensive, so their inclusion in your dog’s food is typically minimal. Supplying omega-3s through supplements is a cost-effective way to give your dog the additional health benefit without breaking the bank. 

Fish oil can be easily mixed in with wet food, and the specific product will have dosing on the container.  

You can also give liquid or capsule fish oil by mouth; it may be given with or without food. Be sure to follow instructions on the label. 

If you notice your pup has an upset stomach after taking fish oil (symptoms such as drooling, licking jowls, pacing, restlessness, vomiting) when dosed on an empty stomach, contact your dog's primary care vet and discuss giving fish oil with food, skipping it completely, or finding an alternative source of omegas. 

Fish oil can take up to a few weeks before full effects are noted, but gradual improvements are typically noticeable. 

Fish Oil Dosage for Dogs

Typically, if you are using a canine-specific omega-3 supplement, there will be dosage information on the packaging.  

Your dog’s fish oil dosage depends on the supplement and your specific pet.  

Always talk to your veterinarian before giving your dog any supplements. 

Fish Oil Side Effects

It’s possible that your dog may not tolerate fish oil and have some side effects from dog fish oil products. If they are given high doses or your pup is prone to GI upset, they may experience diarrhea or other digestive issues as a result. In these circumstances, it may be best to find an alternative source of omegas. 

Your dog’s gut may react OK to fish oil, but if you notice any symptoms of nausea (such as drooling, licking jowls, pacing, restlessness, vomiting) or diarrhea, stop giving the supplements and reach out to your primary care vet to determine next steps. 

Fish Oil for Dogs FAQs

Can you give a dog human fish oil?

Although human fish oil supplements are sourced the same, these are dosed for humans—not dogs. Human supplements may also contain additional ingredients that may be toxic to pets, such as xylitol.  It’s always best to give your dog fish oil formulated for canines. 

Can fish oil help with dog allergies?

Fish oils can be an excellent supplement to help dogs with allergies, particularly skin allergies. By helping to reduce inflammation, fish oils can help improve a dog’s skin and coat by decreasing the itchy and dry skin associated with allergies. 

Does fish oil help with dog anxiety?

Fish oils rich in omega-3 fatty acids (DHA and EPA) can help reduce anxiety due to the effect these acids have on neurotransmitters in the brain. They help to regulate dopamine and serotonin to induce relaxation and decrease symptoms of anxiety in dogs.  

How much fish oil can I give my dog?

When adding supplements to your pet’s nutrition regime, it’s always best to speak with your veterinarian about dosing and frequency and making sure it’s safe for them to consume. Fish oils have a variable dose range so always follow the packaging information to determine the best dose for your dog. 


Lauren Mick, LVT

WRITTEN BY

Lauren Mick, LVT

Veterinarian Technician


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