A wolf-dog is a cross between a pure wolf and a dog or another wolf dog hybrid, usually Malamutes, Huskies and German Shepherds. Hybrids tend to be heavier and taller that wolves.
There is no set physical appearance of a wolf-dog, since there are so many different breeds of dogs. Generally, the wolf-dog is larger than the wolf and dog which they are bred from. There is much controversy centering around the wolf hybrid. Much of this controversy deals with their behavior. While some say the hybrids are dangerous and agressive, others say that they are friendly and playful and much better pets than some breeds of dog. Since there are so many breeds of dog, the hybrid's behavior is often unpredictible. The popularity of these animals has grown dramatically over the years.