What impact can a mare going through her “foal heat” have on her foal? Dr. Wendy Vaala responds. This podcast is from the Equine Life Stages: Foals Q&A audio event.What impact can a mare going through her “foal heat” have on her foal? Dr. Wendy Vaala responds. This podcast is from the Equine Life Stages: Foals Q&A audio event.4/3/2014 20:26