I feed mine IAMS for puppies.
When we got her, the owners said they gave her Pedigree, but our local store contained none, so we began to feed her IAMS, and she seems to like it.
At her trip to the vet's office, they sent us home with a bag of Science Diet, I haven't tried it or anything, not sure that I will. It was basically just a complimentary bag, you know?
