The horse looks threateningly at the camera before barking loudly. (Deleted. Personal opinions about suitable viewing ages and ratings are not appropriate for the Parents Guide.)
A zebra is surrounded by horses that are going to hurt him so he can't race, you don't see the zebra getting beat up but you do see a horse step on the camera implying that they did hurt him. This might be a little scary for kids since they may have seen horses as peaceful animals and then in this scene the horses are acting crazy.