Hi my boyfriend just bought me a pit bull puppy. I am feeding it Puppy Chow , but the people that he got it from were giving it science diet. We got her yesterday and she has had diererra the whole time. She goes like every 3 hours. I am starting to get worried. I dont know if it is from switching the food or if she is sick. Plus she has a rash on her. The guy said that he took her to the vet and its just a rash, and that she had her puppy shots.