One of the most important questions you can ask is how much weight a horse can carry, and this is true whether you are interested in horseback riding for the first time or are a horse fan. Allow me to take a peek. Knowing when the horse’s muscles are sore is crucial for a relaxing and enjoyable ride. Keep in mind that each time an animal is asked to bear a load that is more than 20% of its body weight, it begins to experience severe strain and suffering.