Foal grinding is a normal behavior for foals and is often seen when they are teething. Foals may grind their teeth to relieve discomfort from the growing of new teeth and as a way of self-soothing. The sound that comes from it can be alarming, but it’s usually nothing to worry about. However, if your foal continues to grind his teeth excessively or at times other than when he’s teething you should consult with your vet as there could be an underlying issue causing him pain or anxiety.