Dogs have been pets of humans for thousands of years. Nobody is quite certain when or why dogs first became domesticated. Perhaps dogs took food from prehistoric humans in return for warning of the approach of dangerous bears or lions. It is generally thought that domestic dogs are descended from wolves, but the jackal may be an ancestor. Or the dog may be a cross between the two animals.
Domestic dogs generally have long snouts with up to
forty-four teeth in the jaws. The claws do not retract, like those of domestic cats, so the claws become blunt and stout. Unlike most wild dogs, the domestic dog eats quantities of biscuits and other non-meat food. When dogs run wild they will eat plant material as well as hunt .animals.
Over the millennia that dogs have been kept by humans, the original dog has been selectively bred to produce a wide range of different breeds. Each breed has different characteristics, depending on the task for which it was bred. It is thought that the oldest breed may be the bloodhound, bred to have a keen sense of smell to follow deer and other game through dense forests.
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