Considering that the original horsepower was calculated at 1.5 times a coal mine pony's strength and that most horses now are horribly out of condition compared to horses used every day, I'd say the average horse is less than one horsepower.
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Horsepower is a measure of work. That means, moving a certain amount of mass a certain distance in a certain amount of time. It is defined as 33,000 foot pounds per minute. This means that in one minute, it will move 33000 lbs one foot, or 1 pound 33000 feet in one minute, or something in between, like 1000 lbs 33 feet in one minute. On a different note, torque is just the amount of "twisting pressure" at any given time, and it doesn't matter what speed it is. for instance, 1 foot pound of torque means that if you have a shaft attached to a 1 foot crank, with 1 pound on the end of the crank, you have 1 foot pound of torque applied to the shaft.Howstuffworks has a good article on it here: http://auto.howstuffworks.com/horsepower.htm
horsepower is defined as work done over time lol, so one horsepower is not nessisarly the power of a horse but rather what said horse can do in a set amount of time