Blue Buffalo bad for GSD?
I am a new dog owner, my GSD Niner is 4 mo old. I had been feeding him the petco brand dog food "Authority puppy food grain free" since he was 6 weeks old. I have never had any problems with him, then I decided based on the recommendation of some people to give him Blue Buffalo. After the first day he began to have diarrhea and he has become very lethargic, just doesn't seem his active self anymore. Has anyone heard of this problem with Blue Buffalo? Should I go back to giving him Authority? I am getting worried about how he is feeling, I just want to get him the best and healthiest food for him. Thanks for any help or suggestions