
Sticking my head above the parapet here - you seem to be putting the cart before the horse. It's okay making contingency plans, but there's no need to put them into operation before the event, so to speak. If you rehome the puppy, and then turn out to be perfectly okay, you are going to resent your husband (or I would, anyway).
I can't tell you what to do, of course, but if it were me in your situation I would be asking my friends in the breed if they would have one of the dogs, but to keep their fingers crossed it didn't come to it.
Hope this helps. But it probably doesn't. Sorry.
:)