One study found that the average draft horse can pull a load of approximately 1,800 pounds on a sled. However, some draft horses have been known to pull loads of over 4,000 pounds.
Another study found that the average light horse can pull a load of approximately 500 pounds. However, some light horses have been known to pull loads of over 1,000 pounds.
As a general rule, a horse can pull a load that is about one-third of its own weight. However, this can vary depending on the individual horse and the conditions under which it is working.