The total number of dogs in the whole world is estimated to be around four hundred million.

With the passage of time the dog has developed in a number of different breeds which go range into the hundreds. Each breed has its own different features, and the height can go from a few feet in the case of the Chihuahua, to around a few feet in the case of the Irish Wolfhound. There are also differences in the color, which ranges from light tan to brown and to dark chocolate or red, and from white to gray and to black. The patterns are of a wide variety as well.

According to the DNA evidence, it was around fifteen thousand years ago that dogs began to be domesticated from the wolves, who themselves were descendants of other wolves. According to these dates, the dogs also have the status of being the first animals that began to get tamed by humans.