The only predator my horse has to worry about is the one sitting on her back.
No snakes ,lions, bears, or anything else that could hurt the horse but perhaps a dog. One of my friends was attacked by a dog while out riding her horse on the road. She became dislodged from the horse, it took off with the dog in hot persuit. The horse rounded the corner out of sight of my friend and promptly dealt to the dog. One predator less. The rider was unhurt, the horse held its head high, the dog, well its in doggy heaven if there is such a place. Moral, don't mess with a bush horse.
I live in New Zealand and we don't have predators as such. No crocks, aligators, or sharks well only the type that sell used cars and some of them ride horses which only goes to prove that not all sharks are bad.
I don't envy those that ride where there are large predators as horse and rider is dinner.