Context: 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". By the 16th century, dog had become the general word, and hound had begun to refer only to types used for hunting. The word "hound" is ultimately derived from the Proto-Indo-European word *kwon- "dog".

Question: What was the common 14th-century word for dogs for those who spoke English?
Answer: hound

Question: What breed was so prolific it became a prototype of hound?
Answer: mastiff.

Question: In what century did "hound" start to only apply to hunting dogs?
Answer: 16th

Question: What was the common term for all domesticated dogs in England during the 14th century?
Answer: hound

Question: When did the word dog become the common term for canines?
Answer: 16th century

Question: Hound became the term for dogs who did what activity during this time?
Answer: hunting

Question: What Proto-Indo-European word is hound from?
Answer: *kwon- "dog"