You folks are beautiful. We think Gus had cancer, did the biopsy, and it came back negative. The vet said he took samples in 4 places, but we weren't waiting any longer as he hadn't been using the leg for a few weeks. At first we thought he had pulled or torn a muscle, we live on a farm and had alot of crusted snow at the time, and he is very active, jumps with no effort at all, so figured he had hurt himself that way, but he was starting to hurt pretty good, I said no more, do it. You could see he didn't have the pain right away after the surgery, but when these howling spells started, I knew something was up, and as good and strong as his back legs are, I didn't figure he would have any problems with this, so I'm hoping it is something temporary, I can see he isn't quite as spry as he was a few days ago, although he has looked better this afternoon, I'm hoping being off tramadol is part of that. Thank you everyone for your support. Oh yea, I can sure relate to the sleepless nights people talks about also.