I really need some advice!!! We purchased an 8 year old, 10.5hh Shetland Pony last summer and at first he was really good with the kids. Then things started to go downhill, biting was his first fault. Then he ATTACKED my other sixteen hand Quarter Horse, almost ripping his throat out!!! Then he got into bolting while he was on a line. Now he corners you with his but and tries to kick the stuffing out of you. We do have professional handlers up there but it does not seem to help. We really would like to sell him but who will buy a pony like that?! I really need some advice because, HE IS DANGEROUS!!!!!!!!!!!!!!!