Horses can be scared of anything that moves, especially if it's on the ground (capable of reaching its legs and inhibiting its ability to flee) and especially if it moves in a way the horse hasn't seen before. read more
Horses are not necessarily afraid of snakes, but will kill them by stomping on them if they feel threatened. It’s usually not the snake but the sudden movement that startles horses and causes them to rear. read more
Horses and other hoofed animals, such as deer, are instinctively scared of snakes, and they try to eliminate the threat by stomping on the serpents. These animals do not know how to tell a venomous snake from a harmless one, but a venomous snake can cause great bodily harm to a horse. read more