Mine seems to prefer raw chicken or beef, although the commercial dog food (Forthglade) I get is steamed and he has that with greyhound kibble which even for retired racers is higher in protein than most other dog foods. Having said that, he will eat anything. His favourite breakfast is whey pancakes stuffed with yoghurt and blueberries. He has yoghurt with his breakfast every day, and he won't let me forget it. Greyhounds are much more creatures of habit than most other dogs - something to do with the way they are trained, I think.