5 Must Know Critical Issues With Fish Oil For Pets Critical General Fish Oil Information: Where do we get Omega-3 from? Long-chain omega-3s EPA and DHA are found typically in fatty fish such as mackerel, salmon, herring, sardines, sablefish (black cod), anchovies, albacore tuna, menhaden. Also special marine algae. Short-chain omega-3 ALA is found abundantly in flax seed, chia seed, and hemp seeds. My dog’s food already states it has omega-3 for skin and coat so why am I not seeing…