I have a 20 year old 120-150 lb sulcata who lives in a dog house outside. It has a pig heating pad. It is becoming less vigorous last couple months, eating less and for a week about a month ago i noticed some tissue bulging out around his rear leg axilla for a couple days. This is gone. But she is still less vigorous and eating poorly. Anyone have a clue. She is very difficult to take to vet as i can't even lift her anymore. Any ideas? Head and eyes look normal, she hisses and withdraws limbs like normal when i try to move her.