Omega-3 are essential building blocks that your dog or cat needs for a healthy heart and strong immune system. These very healthy types of Omega-3 fatty acids such as docsahexanoic acid (DHA) and, eicosapentaenoic acid (EPA) are found primarily in cold-water fish all over the world.
Aside from fresh seaweed, plant foods rarely contain EPA or DHA.
Marine oil supplies a variety of different Omega-3 fatty acids, including DHA and EPA, making it the best source of these nutrients. Omega-3 from vegetal kingdom, called alpha-linolenic acid (ALA), is found primarily in dark green leafy vegetables, flaxseed oil, and certain other vegetable oils.