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dog O.E. docga, a late, rare word used of a powerful breed of canine. It forced out O.E. hund (the general Germanic and IE word; see canine) by 16c. and subsequently was picked up in many continental languages (cf. Fr. dogue, Dan. dogge), but the origin remains one of the great mysteries of English etymology.
The term dog may ultimately derive from the earliest layer of Proto-Indo-European vocabulary. In 14th-century England, hound (from Old English: hund) was the general word for all domestic canines, and dog referred to a subtype of hound, a group including the mastiff. It is believed this dog type was so common, it eventually became the prototype of the category hound.