I work with horses. Movie horses are always snorting, neighing, grunting, nickering, or otherwise making noise practically every time they move. In reality, horses aren’t that noisy. They don’t snort or squeal every time they change gaits. I can count on one hand the number of times my own horse has neighed, and he was just screaming for his friends who he couldn’t see over the hill and who wouldn’t answer him.