Dogs were probably the first tame animals. They have been humans pet for at least 20,000 years and possibly as many as 40,000.
Today humans have bred hundreds of different domestic dog breeds, some of which could never survive in the wild.
There are two classes of dogs; Domestic and Wild dogs.
Domestic dogs still share many behaviors with their wild relatives. Both defend their territories and mark them by urinating on trees, rocks, fence posts, and other suitable sites. These scent posts serve notice to other dogs that an animal is occupying its territory.
Many pet dogs also bury bones or favorite toys for future use, just as their wild relatives sometimes bury a kill to secure the meat for later feasts.
Domestic dogs serve as more than companions; many earn their keep by working hard. Dogs herd livestock, aid hunters, guard homes, and perform police and rescue work. Some special animals even guide the blind. In some homes it's like a best friend.
Very cool and friendly creatures.
