The History of dogsDogs belong to
Canid family (Canidae).
Dogs first appeared about 40 million years ago, before any other carnivore families like bears or cats.
Carnivores have a pair of teeth similar to blades that are called carnassials. These teeth are like scissors and can slice through skin and muscle.
Thirty five living species are included in
Canid family tree. There are three main groups.
1. South American foxes 2. Wolves, including jackals, wolves, coyotes, and dogs 3. Foxes including
red fox and his relatives. The dog that we commonly know is
closest kin to
gray wolf.
There is genetic evidence and fossils that confirm that all dogs are
direct descendants of wolves. Skeletons of
earliest dogs and their wolf cousins are very hard to find differences.
There are around 400 domestic breeds of dogs and they all belong to
same species, Canis familiaris.
A group that can successfully reproduce with one another is known as a species. A sub-group of
species is a breed. This has been made by human interaction. All individuals in a breed can reproduce with each other, but
features of
breed can be altered or lost when one breed is crossed with another.