I have a 10 wk. and 3 day old Sheltie. The breeder was feeding her Prism puppy food. I looked it up and it looks like crap. She gave me a baggie full of the prism for transition, which I started slowly mixing with Origin. Within two days she started with VERY mushy and frequent stools. (her stools were fine on the Prism junk). Took her to the vet for well puppy visit/shots. Took stool sample but it tested fine. Vet said to try boiled hambuger and rice for a few days. Didn't help. Then the vet gave us Hills I.D. (crap, I know, but wanted the problem to stop) Still didn't help. Now I see drops of blood in her stool. I don't know what to do. She eats EXTREMELY well and is VERY active and puppy like. Any ideas????? Please help.