About how much does the heart of a 1,000-pound horse weigh? If you are registered and logged in, you can compete and earn badges. This question good toward: Mane-U Horse Health Badge Enter email to receive results: 1. About how much does the heart of a 1,000-pound horse weigh?10 pounds20 pounds 8 ounces1.5 pounds Loading... Share this:ShareFacebookTwitterPinterestLinkedIn