We've given Blue Buffalo to our 5 year old yellow lab since we got him at 8 weeks old. He rarely has diarrhea, people always comment on how soft his fur is and he thankfully hasn't had any medical issues. I was laid off last year and decided to save money by buying Purina- he ate way more (less nutrients??) and his stool wasn't quite normal, that lasted two bags and we went immediately back to Blue- we'll pay the extra $$ from now on.
New York, NY