Dogs develop intolerances due to inflamation in the gut wall allowing undigested proteins to get into the bloodstream. Grains have proteins in them, as do a number of other nonmeat foods, and are known to be inflamatory. You don’t have to believe in it for it to be a fact. That being said, if your dog doesn’t have a problem with grains then your dog doesn’t have a problem with grains and you don’t need to avoid them. Mine does, and it isn’t in my head or the fruit of an active imagination. True allergies are very rare and it is not well understood what causes them, but they are not the same thing as intolerance, no matter what your vet calls them.
