“Did man domesticate wolves into dogs, or were dogs already a separate species by the time they were domesticated — a species more conducive to being domesticated?”
You can’t even get today’s scientists to agree as to whether Dogs & Wolves constitute separate species, or are a single species. The “single species” group is in the minority, but they are pointing at the genetic similarities which is fairly recent evidence, I suppose.
Also, I've read that one guy speculates that dogs domesticated us.