I took my rottweiler puppy mix now (12 weeks old )off Science diet and started him on a 15lb bag of Orijen large breed puppy food. His stool was runny the whole time on Orijen. I do admit i didn't mix it in slowly. That could have been the cause, but after 15lb's I would think his stool would harden up. He wasn't crazy over the food but he did eat it. Do you guys think the high protein is affecting his digestive system? His coat now is super shiny and he looks to be in very good health. I really would like to keep him on Orijen but I don't want him to have diarrhea all the time. I recently purchased a 4lb bag of Solid gold Hundchen Flocken Puppy (Lamb). His stools have hardened up. The protein level in Solid gold is much lower then Orijen. I read a some good things about Solid gold, so I decided to try it. So far so good he's eating it just fine. I really would like him to have the best Dry dog food he can have. Does anyone have any suggestions or comments on what I should do? Or things I can do differently....