It is worth bearing in mind that there is not much to suggest that the term 'werewolf' as used by
Tolkien refers to anything similar to
creatures of 20-21st century movies. It has never seemed to me that these creatures are
mannish in any sense at all. Whilst the form-changing ability may exist, this should not
necessarily be taken to imply human origins. Indeed,
Sauron took the form of a werewolf. This can only mean that he took the shape of a monstrous wolf, but the term werewolf can be applied since he could also assume a human form. If there were to be any truth to
Hobbit legends, I don't think this would mean there were
humans who could turn into
dragons.