Bests & Worsts Reviews from Amazon

I have trained close to 4,000 (yes four thousand) dogs using this collar (and the large size as well). When used properly it is the absolute best tool for calming down hyper dogs. Unfortunately almost no one - including every dog trainer you talk to - know how to use it property. I have never had it hurt or injure a dog. It should fit loosely but not so loose that the two plastic pieces on the rope touch when full pressure is applied. To calm a hyper dog lift and hold pressure so that he weight of the front half of the dog's body is applied. The dog's front paws should lift off the floor slightly. The dog will probably throw a bit of a fit. Just wait for the fit to pass. The collar does not choke! The dog can breathe. After 10 - 60 seconds the dog will sit. (Do not say sit, just hold pressure until he does it on his own.) Then release the pressure completely and pet the dog. The dog will then get up - repeat the pressure until he sits again. Then release pressure and pet. Do this process 3-5 times. Generally by time 4 the dog will stay seated and be 5x calmer than he was 5 minutes before. NOW you can start doing command based training. The dog should wear the collar and a short leash around the house for 2-8 weeks. When he refuses to listen apply calm, quiet pressure until he does. DO NOT USE ON Whippets or Italian Greyhounds. Do not use it without professional support on dogs less than 16 weeks old. Their mentality is too twitchy. Works on biting crazy chihuahuas, terriers, and the like. (Now there will be 2 dozen "trainers" who will chime in and say I'm wrong.) I have trained close to 4,000 dogs with this collar. If it's a choice of getting control or getting rid of the dog, use this collar to get control. Stops barking, biting and hyperactivity primarily. It works based on Carotid Massage (Carotid Nerve, not Artery). Ask 1000 dog trainers what that is and they will all look at you like you're stupid. Ask any doctor or EMT and they will say Carotid massage activated the para-sympathetic nervous system and releases chemistry that counteracts adrenaline. There's a free $250 lesson. It does more, but I'm out of space.