I agree with Cinder and Smoke, maybe you could get a hold of the new owners and let them know how attached you are and either have visits, or let them know if things dont workout that you have a friend who was already waiting for him, that way if he doesnt workout then they can give him to you where you will place him with Dr, G, and he wont even have a chance to go to a worse home or be bounced around,
this whole story is soo sad, Boots is sooo darling and handsome and deserves a terrific forever family!!