Can someone help me figuar this out. i have asked alot of people and the vet about what it might be and they really don't know. She is only 3 yrs old and its pain where you would sit if you where riding bare back. There is a little swellin on the left side of the spine and her spine kinda hurts when i push down on it and she tries to bite me sometimes tellin me that it hurts. I have givin her a 5 day supply of Bute and that seemed to take MOST of the pain away for me to touch and feel what is wrong but i can't figuar it out. Can someone PLEASE HELP me?