Feed Fish & See the Difference! The high levels of marine sourced Omega 3 in this Salmon makes this an ideal product for coat and skin health and joint mobility. The easily digestible proteins from fish are also good for the digestion. Fish4Dogs foods are grain free and use potato and peas as the carbohydrate providing a food that has a balanced GI and one that is less likely to cause dietary sensitivity. High levels of Omega 3 are also beneficial for breeding bitches with benefits of omega oils being passed onto the unborn puppy.