Okay some quick background, I rescued a Rottweiler little over a week ago but sadly can't keep him. I advertised him on an online site, only had him a week so was honest and upfront about how he came to me and that I don't know much of his history only how he has been with me. Couple came to see him tonight and decided they wanted him, they have had rottys before and were going to send him puppy school as at 8 months old he is well trained but boisterious. One hour later they want to return saying he nipped their children. Is this a silly question but am I obliged to take him back?