The singular form a a ground-burrowing mammal that is reminiscient of a woodchuck or meerkat.
Two kids were watching the Discovery Channel on television when a Meerkat came onto the screen. One kid said,"Hey look! It's a meerkat."
The second, who wasn't paying attention, turned to the tv and spotted the animal and said,"Hey! Ain't that one of them ther' gopher dogs?"