Hello: I'm hoping for some answers. This morning I found a rabbit (mid sized not sure if male or female) trapped in some netting we have in our backyard. He was trapped from the back end, about 1/4 of his body. He was breathing a little fast but he was very patient while I ripped the netting and freed him. He didn't have visible trauma other than some fur that had been rubbed away raw from where the netting was located; on the right rear area. He sat up, ears up and scampered off- very alert. I left for work and had my wife check on him before we let our dog out. Sadly, he had passed, within about 30 minutes time from releasing him. Not to be graphic but she said it was as if rigo mortis had set it. Any idea what might have happened? Could it have been a heart attack? I swear he appeared to be normal when he was freed from the netting. In any event, it was a very sad situation. I went from feeling very happy to have found him, release him to hearing that he had passed. Thanks for your time.