From Wonders and Marvels: Ancient Puppy Chow: Dog Food in Classical Greece.

Chasing game (rabbits, deer, bear, boar) for food and sport was extremely popular in classical antiquity, and dog owners took good care of their hunting companions. Ancient hunting manuals by two Greek historians, Xenophon (b. 430 BC) and Arrian (AD 86) preserve lively practical advice on raising hounds.

So, if you lived in Athens at the time of Socrates and owned a Laconian hunting hound like those depicted on Greek vases, what would you feed them? Ordinary pups get barley bread softened with cow’s milk or whey. But more valuable puppies eat their bread soaked in sheep or goat milk. You might add a little blood from the animal you expect your puppy to hunt. At dinner with your family, you scoop soft chunks of bread from the center of a loaf to wipe grease from your fingers—and toss them to your dog, supplemented with bones and other table scraps, perhaps even a basin of meat broth. After a sacrifice or banquet, you make a special treat: a lump of ox liver dredged in barley meal and roasted in the coals. Naturally, as a matter of professional courtesy, you share any rabbits, stags, or boars with your faithful hunting partners. [continue]