Noun
a member of the genus Canis (probably descended from the common wolf) that has been domesticated by man since prehistoric times; occurs in many breeds
Source: WordNetIn man, social intercourse has centred mainly on the process of absorbing fluid into the organism, but in the domestic dog and to a lesser extent among all wild canine species, the act charged with most social significance is the excretion of fluid. Olaf Stapledon
the dog barked all night Source: Internet