Who punched a horse in blazing saddles?

Actually there were NO wires used in the horse fall in Blazing Saddles " Mongo Punches A Horse". This stunt is called a horse fall and the stuntman that did this particular stunt was the late great Jerry Gatlin. A true Hollywood legend. The wires tripping a horse that you are referring to has been outlawed in the U.S. for many, many decades. That way of making a horse fall is called " ( Using wires ) is called "A Running W".. A Hobble placed on a horses front legs just above the front hooves. Under the saddle is a metal ring shaped in the form of the letter "W" ( Hence the term running "W" ) a cable is then staked out into the ground at an approximately 45 degree angle. The rider gallops with the horse when the cable runs out it then pulls the horse over ( end over end ( front to rear ) This throws the rider clear of the horse so he is not crushed, Mike