diarreah in 4 month old golden retriever

Question
Max has had loose stools for two weeks.  Breeder recommended that we change from Diamond Large Puppy food to adult.  We did so 2 days ago.  His diarreah is much worse today.  5-7 loose runny - not liquid - more like pudding to runny pudding.  Do we feed him today?  If so, boiled rice & chicken, or do we go 24 hours without food?  Then do we go back to adult or mix the two?

Thanks so much for your help.
Craig

Answer
Has the vet done a fecal check?  Quite often you need to clean our any parasites.

Try the 24 hours without food, then the rice and chicken until he firms up.  If he doesn't firm up in a week, see the vet.  If he does, slowly work back in the adult food.  

I doubt changing the food would have helped, but it is a good idea anyhow.  Switching to an adult chow for the larger breeds at 4 months, slows growth and helps develop sturdier joints.

Your dog definitely should be narrower at the waist than the hips and chest. You
should be able to easily feel the ribs, but not see them. Each dog is different.
Standard recommendations are a good place to start, but each dog must have its
food and exercise adjusted to its individual needs. Here is a link to a good
illustrated guide, http://www.longliveyourdog.com/twoplus/RateYourDog.aspx