I have heard that non-peds can sometimes throw "bullies", dogs that are overly muscled and often have overbites as well. How often does this occur? Does it seem to be a fluke thing, or dependant on certain lines? And are there usually just one per litter, or have you ever seen a whole litter of bullies? Do they occur in pedigreed Whippets too? Where do they come from? A mutated gene, a result of line breeding/inbreeding or a throwback to the terriers from way back?