Hmm...well, on the other hand, natural yogurt, in particular, contains a healthy amount of good bacteria (including L. Acidophilus) which helps strengthen the G.I. tract. Therefore, I often supplement my dogs' diets with a healthy dollop of natural yogurt. However, because yogurt does contain lactose and dogs do not contain enough of the lactase enzyme to deal with a large amount of the milk sugar, it'd be wise to limit your dog's daily intake to one or two tablespoons. I, myself, am lactose intolerant, but when I had some sort of nasty stomach illness, I ate bowlfuls of natural yogurt. It really did help.

For the record, a breeder I know feeds raw and gives her dogs a LARGE heaping tablespoon of natural yogurt to her dogs every day. Her dogs' weights range from around 35-40-ish.