Dad, why is there a horse at the beach?

Different things happen in Mexico, that don't happen back home. When we got to the beach, there was a man there with a horse. The horse tried to run away from him several times, but the man didn't let it. My mom says that man is called a Vaquero, and that his job is to train horses.

I asked the man what was the name of that horse, but he didn't say. Maybe it's like in that song about the desert, and the horse has no name...