When Johnnie Green sent him along the road at a trot, Twinkleheels' tiny feet moved so fast that you could scarcely have told one from another. Being a pony, and only half as big as a horse, he had to move his legs twice as quickly as a horse did in order to travel at a horse's speed. Twinkleheels' friends knew that he didn't care to be beaten by any horse, no matter how long-legged. "It's spirit, not size, that counts," Farmer Green often remarked as he watched Twinkleheels tripping out of the yard, sometimes with Johnnie on his back, sometimes drawing Johnnie in a little, red-wheeled buggy.