Hello everyone, last week my rabbit Rupert, of 7 years of age passed away. In the last three weeks he was hoping around on only his two hind legs, not using the front two. So I called my good friend Julia to come check him out, and she found this gash, that was from him grooming himself too much. It wasn't infected and we put some neosporin on it. The following day I noticed he was laying down, I tried to get him up but he just fell right back down, so I picked him up and went outside. Out there I stayed with him and petted him for a good 20 minutes. Then suddenly his body almost started shaking like he was having a seizure, and a few moments later he opened his mouth VERY wide and started letting out a huge yelping kind of sound like he was in pain, and I knew right there that he wasn't going to survive. He passed away in a matter of seconds. I believe it might have been from a heart attack or congestive heart failure. Does any of my information sound good enough to diagnose the cause of death. I thank anyone who looks at this, and please help, thank you!