Is Fish Oil Good For Cats and Dogs

What is Fish Oil?

Fish oil is a dietary supplement derived from the tissues of oily fish, such as salmon, mackerel, sardines(Sardine Fish Oil for Dogs), anchovies, and trout. It is rich in omega-3 fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).

Omega-3 fatty acids are considered essential fatty acids, meaning that they are necessary for the proper functioning of the body but cannot be synthesized by the body in sufficient quantities, so they must be obtained through the diet.

Benefits of Omega-3 for Cats and Dogs

Omega-3, specifically eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), offer several benefits for both cats and dogs when incorporated into their diets. Here are some of the key advantages:

  • Help alleviate dry, itchy skin, reduce dandruff, and minimize excessive shedding.
  • Help reduces inflammation and alleviate joint pain and stiffness in pets with arthritis or other joint conditions. Regular supplementation with omega-3s can support joint health and mobility, particularly in older cats and dogs.
  • Improving blood flow, and reducing triglyceride levels.
  • Support  Brain Development and Cognitive Function
  • Help regulate the immune response, reduce inflammation, and promote overall immune system health in cats and dogs.
  • Supports retinal function and can help reduce the risk of age-related vision problems in pets.
  • Support a healthy immune response to allergens.

Which Foods are Rich in Omega-3?

There are several foods that are rich in omega-3 fatty acids. Here are some examples:

Cold-water, fatty fish such as salmon, mackerel, sardines, trout, herring and tuna are the best natural sources of omega-3 fatty acids. Flaxseed and flaxseed oil are also plant sources of omega-3 fatty acids. However, it is worth noting that dogs and cats have a limited ability to convert plant-based omega-3 (alpha-linolenic acid) into the more beneficial forms of EPA and DHA. Therefore, while flaxseed may provide some omega-3 content for pets, it may not be utilised as effectively as marine sources. In addition to this, there are dried algae, marine microalgae that are also rich in omega-3. As mentioned above, Omega-3 supports many of the natural bodily processes that your dog and cat need to maintain good health and is therefore considered an essential fatty acid, so it may be worthwhile to supplement your dog’s diet.

Signs Your Dog or Cat May Be Deficient in EPA or DHA

When it comes to assessing whether a dog may be deficient in essential fatty acids like EPA (eicosapentaenoic acid) or DHA (docosahexaenoic acid), it’s important to look for signs that could indicate a nutritional imbalance or deficiency. Here are some signs that your dog may be deficient in EPA or DHA:

  • Dry or Flaky Skin
  • Dull Coat
  • Excessive Shedding
  • Arthritis
  • Allergies
  • Skin irritations
  • Cognitive Dysfunction
  • Poor Wound Healing
  • Stunted growth
  • Delayed development
  • Skeletal abnormalities

Is Fish Oil Bad for Dogs and Cats?

We know that fatty acid deficiencies, also known as EPA or DHA deficiencies, can harm your dog and cat, so giving your dog fish oil supplements is a necessary nutritional supplement, so why are so many pet owners so resistant to giving fish oil to their dogs and cats, and what are the downsides of fish oil?

Because there are possible side effects to commercially available fish oils such as toxins, digestive problems and dietary issues. All these issues are worth considering, it is a matter of responsibility for the dogs and cats in the family.


Fish oil can sometimes contain toxins such as mercury and PCBs (polychlorinated biphenyls), which can be harmful to pets. It is important to choose a high-quality fish oil supplement that undergoes purification processes to remove these toxins.

Diarrhea and Digestive Problems

Some pets may experience gastrointestinal upset, including diarrhea or loose stools, when first introduced to fish oil. It’s best to start with a small dosage and gradually increase it over time to allow their digestive system to adjust. If digestive problems persist, it may be necessary to discontinue the use of fish oil.

Vitamin E deficiency

Dogs with a grain-rich or grain-based diet may already have lower levels of vitamin E. When taking fish oil supplements, which can have a blood-thinning effect, there is a potential risk of vitamin E deficiency. This can be mitigated by providing a balanced diet that includes appropriate levels of vitamin E or by adding a vitamin E supplement.


Fish oil is derived from fish, and some dogs and cats may be allergic or sensitive to fish proteins. If your pet has a known fish allergy, it is best to avoid fish oil supplements altogether.

Fish Oil for Cats and Dogs Selection Criteria

When selecting a fish oil supplement for your cat, it is crucial to consider an essential factor to ensure the choice of a safe and efficient product.

Inquire about the processing method of the fish oil prior to purchasing. The distillation process is recognized for its ability to eliminate harmful substances like mercury, PCBs, and dioxins from the product entirely.



The powerful benefits of omega-3 as well as EPA and DHA for dogs are undeniable. Fish oil supports your furry best friend’s heart health, makes his coat silky smooth, improves itchy and flaky skin, helps relieve allergies and joint pain, and treats canine arthritis. It can help boost his immune system and even help him fight canine cancer, and studies have shown they can help slow the progression of chronic kidney disease.

The only question is which source will you choose for your canine friend? Diet? Fish oil supplements? Omega-3 supplements? Do what you feel comfortable with and in line with your vet’s recommendations and you can’t go wrong. Fish oils and the omega-3 fatty acids in them are vital to your dog’s health, so if you are considering adding them to your pet’s dietary regimen, be sure to consult your vet immediately.

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