What animal is considered man's best friend?

Dogs have been considered to be man’s best friend for many centuries. There are hundreds of different dog breeds, which have come to be by thousands of years of selective breeding. Since dogs have been around humans for such a long time, research has found that most dogs have a high sociability, causing them to be uniquely in tune with human behavior.

Different breeds all drastically vary in height, weight, color and shape. Larger breeds, such as a German Shepard, tend to be more of a working breed, whereas a smaller breed like a Pomeranian is designed more just for companionship.