I also don't think some of you give enough credit for horses, working with the equipment they are trained in. I have seen quite a few horses stumble and fall with a check rein on (however, these were "properly adjusted" check reins where the horse's mouth is at the breastcollar level) and they did NOT rip their mouth up at ALL! I have actually never seen a horse rip it's mouth when falling with a check. Most understand it and have some sense of self-preservation.
In fact, in most cases I have found the check rein encourages a fallen horse to remain on the ground until the driver is able to safely unhook the horse. Because a horse must dip it's head down and THEN lurch forward to get up, the check reminds the horse to remain where it is.
I still don't think they are evil, they just have their own place in some disciplines. Some people think putting shoes on a horse at all is unnatural and cruel. I think most bits with leverage are unnatural and cruel but they certainly have their use in some disciplines.
I also don't see where having an overcheck on is going to make a horse MORE than what it is bred to be. If it can't physically hold it's head there, the check isn't going to MAKE it do that. These horses NATURALLY break level and carry their heads high! It's just EQUIPMENT you are adding! A bit can't MAKE a horse more or less than what it is, but the right bit fitted properly can enhance the horses' response to you. They ARE bred to perform that way.
This is my Modern Shetland mare. She hasn't had any weighted shoes or action aids applied:
She doesn't have the extreme long, upright neck that the top Moderns have, but I think her motion is very nice. She naturally moves this way. Putting an overcheck on her will not make her magically have the upright neck set that a Champion Harness Pony would have, because she was not conformed that way.
By comparison, a little colt I just bought seems to have a higher neck set than her:
He should NATURALLY be able to carry his head higher than her, check or no check.
Horses are TRAINED with whatever equipment is needed for their discipline, be it overchecks, western saddles, stallion tack (side reins), breastcollars, full draft collars... and what is the extent of "cruel"? Different disciplines will always be considered cruel depending on the viewer's experience. I think horses do what they are bred to do. Is western Reining cruel... forcing such strain on the hocks and legs to do such incredible quick athletic maneuvers? Is stadium Jumping cruel, for forcing horses to leap incredible jumps and sometimes falling? Is draft horse pulling competitions cruel, forcing a horse or two to pull a weight with every fiber of it's body even if the load is too heavy? Is fine Harness cruel, forcing a horses' head up with a check rein? These horses are all athletes, trained to do what they were bred to do because they have the conformation, mind, and talent to do it. The owners and trainers love them and care for them and are usually in awe of what the horse is capable of.
Where is the line drawn in the use of spurs, whips, stud chains, bits, shoes, saddles.... it's all in the eye of the beholder AND the proper or improper use of it.
Andrea