I agree with Debs about re-homing, we had a large ginger tom in the rescue that was unpredictable (Nero from a previous thread ) one minute he would purr for britian ,next he would sink teeth in,we were told he hated other dogs but would tolerate a female cat,the couple that took on Nero were fully aware of his habits, they already had a male cat and two dogs but decided to give him a chance,hes now been there with them for a couple of months and is a different cat, the first 3 weeks he hissed at the cat and went for the dogs but now he sleeps with the dogs and is tolerant of the other cat and occasionally plays with him but only on his terms, we had Nero for months and he was deemed un-homable because of his temperament but given the chance hes fully repayed it now and is a fully fledged member of the family, so i say give them a chance if possible they do adjust to most circumstances and settle happily