From Middle English hound, from Old English hund, from Proto-West Germanic *hund, from Proto-Germanic *hundaz, from pre-Germanic *ḱuntós (compare Latvian sùnt-ene (“big dog”), enlargement of Proto-Indo-European *ḱwṓ (“dog”). Doublet of canine. In 14th-century England, hound 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.