A goat dog was present when Aang built a new zoo in the Agrarian Zone of Ba Sing Se for Kenji, the zookeeper. When Aang used his bison whistle to call for the zoo animals, many domesticated creatures, such as the goat dog and a small child's pet cat, accidentally responded to the call. The animal appeared in the cage of an elephant mandrill, along with several types of cat.
The goat dog has a short, squat build, with a round body supported on stout legs and hoof-like front paws. It has a long, shaggy white coat that covers its entire body aside from its paws. The hair on its face is curtained, splitting at the snout. It has short erect ears and a brown oval-like nose. It also possesses a long, fluffy tail.
The goat dog shows influences from a number of small dogs: the Yorkshire Terrier, Shih Tzu, West Highland Terrier, the larger Old English Sheepdog, and a small hoofed animal, such as the goat or sheep.