Most dogs love canned, or wet, food, and it has a long shelf life, and is easy to find at any supermarket, but it can be expensive. For some owners, it’s definitely worth the expense, but not every brand of commercial canned food provides the protein that your pup needs. The real question is how much digestible protein it provides. Indigestible protein will pass through your dog’s system without being broken down into absorbable nutrients, so it's pretty much useless to him.