It's easy to forget how many things the human body is able to do that other animals can't. Not only do we have the ability to speak and solve complex problems, but even something as simple as having opposable thumbs makes a world of difference.
Think of all the things that our bodies are capable of that other animals aren't just because we have two legs instead of four! We can climb, pick things up, and even reach our backs!
With that in mind, animals often find themselves trapped in difficult situations that we would have no problem getting ourselves out of. When they're in a situation that humans would find scary, an animal ends up being in even worse shape! So when this horse found himself unable to get out of a sinkhole, it was up to some skilled humans to help.