Why do pets need protein?
Proteins are necessary for all aspects of growth and development and are very important in structural makeup and the immune system. In addition, they are burned as calories and can be converted to and stored as fat. As a general rule, cats need more protein than dogs. Dogs and cats actually require a number of amino acids (the building blocks that make up proteins). Some of these they can make within their bodies; others they must have in their diet. Different protein sources provide different levels of the various amino acids, so that is one of the reasons you may find there are several protein sources within a food.
