How well I know, unfortunately ... for me, I was trying to free a client dog who had tried to climb a gate, only to get his paw trapped in the butterfly latch. He bit me when I reached to try and free him. :/
Unfortunately I'm a big wimp with that stuff, I went into shock though the bite wasn't severe and almost blacked out. :/
Ouchies! When I worked in a wild animal rehab station I had to deal with animals in pain, a *lot*. Got bit, too, but few others were willing to take the chance. But I can't stand seeing an animal in pain. I'm so sorry for you. I hope it all worked out.