Hard to do wiggal, but you must do what's best for your dog. I had to find a new home for one of my terriers after he attacked the younger dog. It was an awful time, there was 2 yrs between them, they were Uncle & Nephew, and until then, inseperable. They slept, played and ate together, travelled with us in the wagon, they were good little house dogs too, then out of the blue Teddy turned on Gizmo, really hurt him. I tried muzzling him, keeping them seperate which was a nightmare in a small house and after advice from the Vet had Ted's 'bits' done all to no avail. He was still aggressive to Gizmo and then Giz tried to fight back which made things worse. Teddy put on weight because he was getting less exercise because they were apart and I had to walk them seperately. A friend at the stables offered to take him on a trial basis to keep her older terrier bitch company. After 2 weeks she said he wasn't coming home to us! He'd got on so well with her dog, became attached to her disabled father and settled in well with the family that they wanted him to stay. I get regular updates on how he is and photos, but I've not been to see him as I know I'd get upset and I didn't want to disrupt him in his new home when he was happy & settled. The decision although heartbreaking at the time was the best thing in the world for both dogs, their needs had to come first. I'm glad for Teddy & Gizmo I did it, they are both happier dogs now. Do the right thing by your dog