How did the physical apperance of horses change overtime?

Today we have large, long-legged, fast-running horses (www.txtwriter.com). 30 million years ago, horses were as small as a fox. A horse used to be a mammal with toes instead of hooves. The horses teeth were originally very small. Over time, the horse teeth increased in length and have a complex shape. The horse's physical appearance evolved from head to toe. ( www.truthinscience.org.uk)