Hi Quincy is 18 weeks was on Purina pro plan, after several weeks had bad diarrhea and went on bland (I/d) diet. Weaned back onto the Purina, was good for a week and diarrhea again. Back on bland and this time weaned onto all life stage healthy extension. Great for 2 wks and suddenly thurs/fri diarhea again. This time I did boiled chicken and pastina. Stools firmed up immediately. The vet said to feed this for 3 days and then transition him to a puppy kibble, her recommendation was purina pro plan puppy. She said maybe his digestive system needs to mature. I’m ok with all this, dropped off a stool sample just to be safe, but I’m not a big Purina fan. Any suggestions or similar puppy belly issues?