Just a thought. When I took my little Reggie & Laci to the vet because of blood in their stools, the vet did tests but she also took them off the Royal Canin and Nutro Natural Choice Puppy Bites that I had them on and put them on Science Diet. She has lots of displays with Science Diet products in her waiting room and even sells it to the public. Could she have done this just because she's getting a commission on the sales from Science Diet? Or do you think she really feels it's a better product? I must be sounding suspicious ??? I do like my vet. She came highly recommended and each time I take the pups to her with a problem, there is genuine concern and she does run tests that seem appropriate. They have not been very excited to eat lately, so I changed them back to Nutro alone. They are eating better, BUT they still have blood ocassionally. The breeder told me to feed them a tablespoonful of pumpkin a day and this would make their poo harder and get rid of the blood. I just started it yesterday so there hasn't been enough time to tell.