I have a 13h Pony who refuses to go in the float. We have tried many things such as making outside the float horrible but nice inside. When I lead him up to the ramp he will step on it then pull hos head away and bolt, sometimes he will rear or kick out at something. Several people who have tried to help have gotten hurt and have even ended up beneath him. When I put pressure on him, like touching his hindquarters he will immediately back up out of the float. Please help me.