What might a pony that eats too much grain or grass develop?

A pony that eats too much grain or grass may develop laminitis, a serious and potentially debilitating condition that affects the feet. Laminitis occurs when the lamina, the sensitive tissue that connects the hoof wall to the coffin bone, becomes inflamed and damaged. This can cause the coffin bone to sink and rotate within the hoof, leading to severe pain, lameness, and even founder, a condition in which the hoof wall separates from the coffin bone.