i am very satisfied

Collar I received was an official Herm Sprenger. Also, the collar I ordered has 2 "O"rings, not a swivel (which I prefer, my leash has a swivel). Sprenger DOES make a non-swivel collar (one previous reviewer seemed to think his was a fake due to not having a swivel, which is not accurate). This prong collar has made a night and day difference with my pittie mix rescue. He's is about 40lb and I had to take one link out of the small 2.25 size collar. I prefer the black stainless (anodized steel not painted black) so it's less obviously on my dog. If your dog has light fur, the stainless steel (not chrome plated) is less likely to discolor their fur. Go for Curogan if your dog is sensitive to nickel, but it can stain light colored fur as well. These collars look scary but when properly sized, introduced and used only during training they are the most humane and effective way to communicate with your dog.

After removing the previous HS fur saver chain collar that was on our rehomed GSD which he outgrew (his previous owners gifted that and left it on him), I figured why not try and use a leather/chain martingale collar on him. I WAS WRONG. Our pup who is trained in personal protection and bite work was trained with the good stuff, meaning stainless steel Herm Sprenger collars. You name them and he's had it on him at one point. When we applied his new collar, he took the martingale collar like it was nothing to him since there really wasn't any sort of "weight" to it. Any correction we did with it, I swear he'd laugh in his head and pull us like he was a sled dog or he'd try and choke himself as much as he could which didn't work since there was only so much correction the martingale did that it pretty much acted like a flat collar. Then I went with a martingale and a body harness. Once again he turned into a sled dog pulling us, the only difference was that his body harness made him look like a super cool working dog. After extensive research on a prong collar versus using a chain, I ended up purchasing the prong since it was a lot less hurtful on the trachea compared to a regular choke chain collar. I haven't took him out for a walk yet, but with some heel commands in the backyard our dog has actually listened and has resisted the urge to pull with this collar. Having the slight weight of the stainless steel around his neck makes him know that it's time to focus/listen. Of all the useless collars, harnesses we spent money on these past few months I really wish I had thought of the prong collar before hand.
To be honest I was pretty biased to it at first thinking that it was inhumane, but the more I researched the more I realized that as a responsible dog owner this was an investment worth having. Like I said, do your research about prong collars and know how/where to correctly apply it on your dog. When out in public now and I see an owner have a prong incorrectly placed, I try and tell them to fix it and get the correct fit to get the actual effect of how a prong collar works.

My dogs neck measured at 19 inches, when I put this on him it was actually too big on him. I only had to remove 2 links to get the correct fit. I actually regret purchasing a few extra links since I didn't even need them. Of course being 3.2mm, it could be a bit tough to remove/apply for those who have small hands like myself. My husband has no problem putting it on, but I struggle a bit trying to pinch the links together.

Our collar was purchased from 101outlet if I remember correctly, and it was an authentic Herm Sprenger collar that we received. Our also came with the swivel D-link, I had no preference to whether it was the double O rings or not. It works either way. No complaints what so ever.

Our previous one from a cheaper brand broke. This was very scary as our dog ran after a squirrel, almost hit by a car. So we were extremely disappointed as we never envisaged this would happen. So we decided to go for a real brand, and higher quality. The price is more than worth it and this is an excellent product. A bit difficult to get it off our Labrador's head as it has spikes. He does not like it when we remove it. But the quality is excellent, so worth it and we can rely on the sturdiness. We highly recommend this collar. PS make sure you buy the real one, not the one with the same name but not having the little red label.

I have been training my 9 months old doberman puppy with a martingale collar for at least 6 months. As he grows stronger every day he pretty much has been ignoring the pressure applied by the collar when he pulls or bolts to something. I wish I had started him on a prong collar sometime ago. The first moment I put on the Herm Sprenger he noticed he would not be able to ignore it. I don't yank the leash at all, and have spent good time teaching him leash pressure, but I guess he was strong enough to ignore the one applied by the martingale. Now, with the Herm Sprenger he is showing that he has learned very well how to release the leash pressure. Our walks have become much more pleasant and a time for good training and enjoyment as I do release him several times from the heeling position. My back and shoulders are so much reliefed. The black collor is a great match to his black fur and doesn't make the collar to stand out. I do recommend the product as it seems to be of great quality stainless steel. However, please make sure you use the tool as a training tool, not as a punishment one. Teach your dog how to walk on a loose leash, and fit the collar properly snug at the top part of the dog's neck.