What tool is commonly used to clean a horse's hooves?

The tool most commonly used to clean a horse's hooves is the hoof pick. This specialized tool is designed to remove dirt, debris, and stones that can become lodged in the crevices of the hoof. Keeping hooves clean is essential for preventing infections and ensuring the overall health of the horse, as dirt trapped in the hoof can lead to issues like thrush or abscesses.

Other tools listed, while important for grooming or caring for a horse, serve different purposes. A curry comb is used to loosen dirt and hair from the horse's coat, while brushes are utilized to remove dirt and dust from the coat after it's been loosened. A sponge is primarily for cleaning the horse's body or face but is not effective for hoof care. Thus, the hoof pick is specifically designed for the crucial task of maintaining hoof health, making it the correct choice.