I have read a few posts here and have noticed no one recommends or uses Hills Science Diet. I have used this from my Rotty to my Pitbull days. I personally swear by it. I've always given all my dogs the puppy formula because of the higher nutritional value. It kept my beloved Blue at a consistant 126 lbs. and healthy as a 18y.o. Marine. Once Gunny got home we put him on it and bulked up a bit too. The vet was very impressed at how he improved in size and healthy wieght in a month (7 lbs to 14.8 lbs).