Review on JIPIMON Adjustable No Pull Dog Collar: Quick Release Training Collar with Rubber Tip - Ideal for Small, Medium, and Large Dogs by Christine Flores

This is a great collar but you need to know how to use it to be effective. The spikes on the collar are not intended to dig into the dog's neck, but rather to pinch the skin around the neck, much like a mother dog bites a puppy's neck. To correct the dog, you jerk the leash sharply. This causes the collar to pinch the skin on the dog's neck. It doesn't hurt. If you let your dog pull the collar, you are using it incorrectly and it is no more or less effective than a choke collar. We have a 90 pound Old English Sheepdog with strong muscles (and quite a lot of hair). . It's strong enough to support the full weight of my body and will pull hard enough to knock my wife off her feet. Once properly trained with this collar, he'll become a model citizen on a leash (he's also the best dog in the world).