I have a new Border Collie puppy, 3 months old. What is the best kind of food for Border Collies? Right now we are feeding her what the pet store was feeding her, Nutro Ultra Large Breed Puppy dog food.

I have a Border Collie and a German Shepherd. They are both being trained as agility and service dogs. Right now I feed them puppy feed, but I want to know what dog food I should feed them when they are old enough. I don’t want TOP TOP brands because I wouldn’t be able to afford it. So what brands are both quality and affordable? Pedigree? Iams? Eukanuba? Any Others? I want strong joints and digestive systems by the way. Hehe! Thanks!