My horse is an OTTB who has the opposite problem of most ex-racers. He won't go! Yesterday we started out on a ride and we got a little ways down the road. He walked slower and slower until he finally came to a complete stop. He stopped in the middle of a dirt road and just stood there. He didn't seem scared; he was just looking around. I squeezed with my legs, slapped his rump, and used every other "GO" signal I could think of, but nothing. We sat there for at least 5 minutes. Finally, a car came and I had to hop off and lead him away. I know I lost the battle of wills by dismounting and rewarding the behavior, but I had no choice because of the car! Any ideas why my horse is doing this? Any ideas on how to get him to move his feet?