> So with an AWOL breeder, with evidence that I have been trying to get in contact, with evidence that he has been microchipped in my name since June, is it possible to get the KC involved in some way to transfer his paperwork?
As I understand it from your post, and I could have picked it up wrong, but it sounds like the purchase/transfer hasn't been agreed, he still belongs t the breeder, I don't think you can transfer his paperwork or get him neutered or sell him, he's not yours to do any of that with.
Just read down the rest of the replies, great answers, I'm another for staying kind (as you have been) and trying to help as much as possible by sending sae etc and offering to get replacement paperwork, if she does want to let him go permanently.
It was very kind of you to offer to take him while the breeder is clearly having a tough time, just be patient a bit longer and if you can't then please return him, I'd be pretty furious if a friend that was looking after one of my dogs sold him to someone else!