if your dog was biting or maiming or killing whatever it could get it's mouth on, i would consider euthanasia but 1 rabbit? no way. my friend's rottweiler had a series of attacks and issues with her temper as she got older and the dysplasia complications grew worse. in a matter of two weeks she attacked the mailman, bit my friend's dad while he was working in their yard, and murdered the cat. it sucks but they put her down after the cat. sure, she was just being a dog but the attacks got too frequent for their comfort. one rabbit attack doesn't seem like grounds for the death penalty.