Picture of a small vicious animal that eats mustangs?

There is no small, vicious animal that eats mustangs. Mustangs are large horses, and their natural predators are primarily wolves, coyotes, and mountain lions. These predators are much larger than mustangs and are capable of taking down a horse, but they typically target young, weak, or injured horses.

It's important to remember that wild animals are complex and their behavior can vary. However, there is no known small, vicious animal that would prey on healthy adult mustangs.