The Hidden Problem with Most Fish Oils for Dogs, and Healthier Alternatives
Fish oil is often promoted as one of the best supplements for dogs, but not all fish oils are created equal. While omega-3 fatty acids are essential for skin, coat, joint, and brain health, many commercial fish body oils are highly unstable and prone to rancidity, meaning they can do more harm than good.
The Issue: Rancidity in Fish Oils
Omega-3s are delicate fats that oxidize easily when exposed to light, air, or heat. Most mass-produced fish oils (especially those sold in clear bottles or stored at room temperature) become rancid long before they ever reach your dog’s bowl.
When oils oxidize, they lose their nutritional value and can even produce harmful free radicals that stress the liver and contribute to inflammation. This is the exact opposite of what you want from a supplement.
Rancid fish oil can cause:
Digestive upset (gas, vomiting, diarrhea)
Increased oxidative stress and inflammation
Dull coat and dry skin
Depletion of vitamin E and other antioxidants
Better Alternatives for Omega-3s
🦑 Calamari Oil
Sustainably sourced and naturally rich in DHA, calamari oil is one of the most stable marine omega-3 sources. It’s less likely to oxidize and offers exceptional bioavailability. Dr. Peter Dobias makes a great supplement called “FeelGood Omega”. *not sponsored
🌿 Algae Oil
Algae is where fish get their omega-3s in the first place! Algae oil provides pure EPA and DHA without ocean contaminants or oxidation risks. It’s a clean, plant-based, and environmentally friendly choice. There are multiple companies that make a quality algae oil - Four Leaf Rover, Fera Pet Organics and Adored Beast Apothecary are trusted brands. *not sponsored
🐟 Whole Fish (Fresh or Frozen)
Feeding whole sardines, mackerel, smelt, anchovy or herring gives your dog naturally balanced omega-3s alongside essential vitamins, minerals, and amino acids. Whole foods are always more stable and nutrient-dense than isolated oils. A rough guideline for a serving size is about the size of your dog’s paw. Fish can be fed daily but you only need to rotate them into your dog’s diet 2-3 times weekly for the benefits.
🥫 Canned Fish (Packed in Water)
Canned sardines, salmon, or mackerel (no salt added is preferred) are an easy, shelf-stable way to include omega-3s in your dog’s diet. Fish can be fed daily but you only need to rotate them into your dog’s diet 2-3 times weekly for the benefits.
💡 Final Thoughts
Omega-3 fatty acids are vital for your dog’s health, but quality matters far more than quantity. Most fish body oils on the market today are already oxidized before you even open them, leading to hidden inflammation rather than healing.
At Canine Karma Training Virginia, we emphasize whole-food nutrition and high-quality supplements that actually support your dog’s health. Opt for calamari oil, algae oil, or whole fish over typical fish oils to give your dog safe, bioavailable omega-3s that truly make a difference.
