A mammal, Canis familiaris or Canis lupus familiaris, that has been domesticated for thousands of years, of highly variable appearance due to human breeding.
Any member of the Family Canidae, including domestic dogs, wolves, coyotes, jackals, foxes, and their relatives ; canid.
From Middle English dogge (whence also Scots dug ("dog")), from Old English dogga, docga, of uncertain origin.
The original meaning seems to have been a common dog, as opposed to a well-bred one, or something like 'cur', and perhaps later came to be used for stocky dogs. Possibly a pet-form diminutive with suffix -ga (compare frocga, *picga), appended to a base *dog-, *doc- of unclear origin and meaning. One possibility is Old English dox (compare frocga from frox). Another proposal is that it derives from Proto-West Germanic *dugan ("to be suitable"), the origin of Old English dugan ("to be good, worthy, useful"), English dow, German taugen. The theory goes that it could have been an epithet for dogs, commonly used by children, meaning "good/useful animal."
In 14th-century England, hound (from hund) was the general word for all domestic canines, and dog referred to a subtype resembling the modern mastiff and bulldog. By the 16th century, dog had become the general word, and hound had begun to refer only to breeds used for hunting. In the 16th century, the word dog was adopted by several continental European languages as their word for mastiff.
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