Domestic dogs are derived from wolves, right? Maybe not. There is apparently a minority view that says that a better interpretation of behavioural, morphological and genetic differences between the domestic dog and the wolf is that the dog was domesticated from a now-extinct, pariah-like precursor, with occasional hybridization with wolves along the way. You can read more about this controversial view on Darren Naish’s zoological blog.
Looking at our cockapoo (spaniel/poodle mix), it makes one hell of a lot more sense to me that at least *some* domestic dogs evolved from a now exinct canine that was perhaps similar to a wolf in some respects, but definitely something other than a wolf.
15,000 years just seems way too short to reliably breed something that’s so very different.