Triple purified high potency epa and dha rich omega 3 supplement from vetplus for use in dogs essential fatty acids efas play a number of vital roles in the structure and function of the mammalian body fish oil is the optimal and direct source of pre formed eicosapentaenoic adic epa thes are the long chain omega 3 polyunsaturated fatty acids which are required by the body mammals cannot synthesize epa and dha and therefore they rely on dietary intake to meet their requirements