A dog that will provide just enough meat to comfortably serve one.
Examples are chihuahuas, the 'toy' group, and most terriers.
Look, it's a dinner dog!
A Dinner Dog is the sort of guy who will cut a man's grass without care or consideration. The term can also be applied to anyone who eats food, typically a dinner, belonging to or designated for consumption by another person.
Sullivan, i was saving that leftover pizza for later, plus you tried to make out with my girlfriend- you're such a dinner dog.