Potatoes are potentially poisonous as they are members of the nightshade family. Tomatoes and peppers are also thought to be. I don't know of any horse actually having problems from eating them, but most horses probably don't find them appealing. I think the most danger is from the green part of the plant rather than the fruit or veggie that we eat. However, it's probably not worth the risk, when they can eat most every other vegetable in your kitchen anyways. Sweet potatoes are fine, and actually quite nutritious for them. But with any treat, a little goes a long way. So a few bites might be fine, but several pounds could cause colic or even laminitis from the dietary disruption.
Last edited by barefoothooves; 10-30-2009 at 12:01 AM.