Here are a few I found. I'm not sure if this is what your looking for or not. There was a forum I belonged to when I had my horse, but can't think of the name right now. If I find it I'll let you know. It was a really nice forum.

Horse Forums

A White Horse

EquinePost.com

Daily Equine

Ok I found it. Maybe someone one on these message boards can help you.

Horse Talk