The halti and gentle leader are basically the same except the gentle leader can be tightened around the muzzle if your pooch is a snapper. Both work on the idea that where the head goes the rest of the dog will follow. I've had good sucess with them on a wild setter/pointer? mix. Also used in my obedience class is the "Scruffy guider"- see www.mistypinesdogpark.com for info-I've never tried it but I've seen it used sucessfully on big strong dogs.