All modern dogs are decended from wolves. By 14,000 B.C. dogs were the first animals domesticated by humans. There are about 40 species in the dog family. Wolves are larger than dogs. Both bark to communicate.
Wolves use sight more than smell as their main sense.
There are eight groups of dog breeds. They are sporting, hound, working, terrier, non-sporting, toy, herding, and miscellaneous. The American Kennel Club recognizes 146 different breeds of dogs. Dogs in the working group are good at guarding property, performing rescues, and pulling sleds. Some breeds that are good sled dogs are Siberian Huskies, Alaskan Malamutes, and Samoyeds.