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You can find coatings specifically made for this purpose. The idea is they taste bad, and then your horse doesn't want to crib on that surface. Another option is hot sauce from the grocery store. Use a paintbrush to add a thick coating to the items, and then let it dry.  Look online or at your favorite equine store for bad-tasting coatings. You could also try non-toxic soap. Place the collar just behind the horse's jaw, and tighten it around the neck. This collar won't affect the horse's eating or drinking, but it's just tight enough to prevent it from cribbing.  Generally, horses don't seem to find these collars uncomfortable. However, you should check under your horse's collar often. The horse can develop lesions due to how tight it has to be prevent cribbing. Take the collar off when your horse is exercising. This option fits over your horse's mouth, allowing it to still eat and drink but blocking it from cribbing with a metal bar. While these also don't seem to be uncomfortable for the horse, they may not be as comfortable as wearing a cribbing collar. Cribbing rings prevent the practice by not allowing the horse to make contact between its teeth and the object it is cribbing. The ring is inserted around the front teeth, but it can fall out easily. It may slightly inhibit your horse's ability to graze. Your vet should put the cribbing ring in. While this board won't stop your horse from cribbing, it does allow your horse to do it a little more safely. This can be a solution if you simply can't stop your horse from cribbing. You may need to discourage your horse from using other boards in the area by using a bad-tasting coating.
Apply a bad-tasting coating to the objects your horse cribs to discourage the behavior. Use a tightly applied cribbing collar for an easy solution. Put a cribbing muzzle on your horse if a cribbing collar doesn't work. Try a cribbing ring around your horse's teeth if other options are unsuccessful. Cover a board with rubber for your horse to use for cribbing.