My boy got excited and nervous, not wholly unusual in the circumstances. What was unusual was that I could hear a loud thumping noise. Ba-bump, ba-bump, loud enough to think it was next door. It turned out to be my horse! I felt his heart vibrating so strongly with each thump - it was unreal! I thought of grabbing my stethoscope in my tack box but did not. As my horse calmed down his heart rate (very strong and fast thumping) became quiet and slower, and then I could no longer feel it beating or thumping, nor hear it. I know or have heard that TB's have extra large hearts or can pump more blood in their hearts, but I have never heard or experienced this before! Anyone else??