I've had Greg for quite some time now. At first he was a bit aggressive and anxious which is understandable since he moved into a completely different environment. After a month or so, he go so much better; was still a but anxious will new people but so much better and never bit or ran towards anyone. All of a sudden, he has been rushing towards people and just not tried to bite me when I pet him. I held my hand down within his eye sight so he knew I was there, and when I proceeded to pet him he lunged toward me and went to bite and actually growled at me. I don't know what I should do. He is quite an old bunny, has been neutered and I have been trying to be more interactive with him since I have gotten him but he just appears to be getting more and more aggressive. Is there anything I can do or would it be best to put him down since he just seems to be getting more violent and aggressive?