Both our Salmon Complete food and Trout Complete food are full of nutrition, so there’s very little difference in their nutritional value. The main difference is that salmon is a rich, oily fish with loads of Omega 3 in it, which is wonderful for skin, coats and joints, while trout is a lighter fish altogether and easier to digest. Our Trout Complete food would be more suitable if your dog is recovering from an operation or simply has a sensitive stomach.