typical of some vets, selling their expensive gimic food to the pet market ,,,,,,, not sure if the dog maybe had colitis the way you are talking, but he would be better off on tins of chappie for any stomach/gut problems with food or make him some boiled rice with some chicken or fish every day, I bet it would still be cheaper and healthier than the dry food the vet is "recommending", which is far to high in protein for that particular dog imo. I would seriously opt for the chappie for him and to help him lose weight I'd be giving half a can a day until he got to some sort of normal weight for