Purina Puppy Chow For Cattle Dog Rottie Mix

My dog is part Australian Cattle Dog and part Rottweiler. Her name is Lucy and she's 4 years old. Her dog food is Purina Dog Chow and when she was a puppy I used Purina Puppy Chow. I used the brand because my vet recommended it and it was a nice dog food that wasn't extremely expensive. I purchase her food in bulk at Sam's Club because it is cheaper to do it that way.