Mans best friend
The dog is humanity’s oldest companion. Human and dog came together thousands of years ago for mutual comfort and slowly developed the interdependence seen today humans caring for the dog in return for continuing companionship and a great variety of the working functions.
The gradual recognition of many difference ways in which the dog could contribute to the association has led to the development an enormous variety of dog types. All varieties of dogs are members of a single species; it is the most variety of any species known, ranging from the tiny Chihuahua to the massive Irish wolf hound.