When do horses loose their milk teeth?

If it is a young horse, they will lose baby teeth at about 2-3 years of age and the adult teeth will replace them. If it is an old horse, the teeth are much looser and the gums are not as strong, so an aging horse may start to lose teeth at anywhere from 15-30 years of age. In this case, a change of diet needs to be made. Feed your senior horse softer foods and grains that do not need a lot of chewing.