What change occurred in the shape of each species from hyracotherium and Equus?

Hyracotherium, the earliest known ancestor of modern horses, was a small, dog-sized animal with a more elongated body and short legs. Over time, as evolution progressed towards Equus, the horse's body shape changed significantly to become larger, with longer legs and a more elongated neck, enabling greater speed and stamina. Additionally, the teeth adapted for grazing, reflecting a diet shift from leaves and soft vegetation to grass. This evolutionary transition illustrates both adaptations to changing environments and the development of specialized traits for survival.