The domestic dog is a subspecies of the gray wolf, a member of
the Canidae family of the mammalian order Carnivora. The term "domestic
dog" is generally used for both domesticated and feral varieties. The dog
was the first domesticated animal and has been the most widely kept
working, hunting, and pet animal in human history. The word
"dog" can also refer to the male of a canine species, as opposed
to the word "bitch" which refers to the female of the species.