I am having some problems with my boy, he is a great horse super sucky loves hugs and getting groomed. On the ground he is usually pretty good mannered..but riding I have been having issues. He can be 2 totally different horses the first one is super lazy slow and he listens pretty good. The other side of him is he is quick super ****y and will buck when I try to pick up the canter. Now at first we thought it might be his tack..it all got checked and it all fits. I ride him In a mild loose ring we are working on just establishing his Rythm (sp?) and supplness. I really dont know why he acts so ****y and bucks. I have not changed his food or anything.. any suggestions on what it could be??