If your horse has flat feet, you may be able to tell by looking at their hooves. Flat feet can cause the hoof to become misaligned, which can lead to problems with the horse's gait. If you notice that your horse's hooves are not pointing straight ahead when they walk or trot, it is possible that they have flat feet. Another sign of flat feet in horses is if the horse's hooves seem to be splayed outwards. This is because the foot cannot support the weight of the horse properly, which causes the hoof to spread outwards. If you think that your horse may have flat feet, it is important to talk to a veterinarian so that they can diagnose and treat the condition.