The Gentle Leader was not painful for my dog, but it was annoying to him, so the behavior stopped nearly immediately. We've been using this for a week now and it feels like a miracle. We're slowly moving back up to walking a few miles a day, and he isn't pulling or barking at the neighbor dogs. He does occasionally whine at them, like his habit of barking is trying to escape, but knowing how the collar will react to the barking and pulling keeps him from trying. Developed by a veterinary behaviorist, the Gentle Leader is recommended by veterinarians and trainers as a humane solution for dogs that exhibit pulling, lunging, or jumping behaviors during walks. This redirection naturally discourages pulling by guiding the dog to focus on the owner rather than external distractions. The design capitalizes on the principle that where the head goes, the body follows, making it an effective tool for managing leash manners. If you are like me and walking two dogs, one of which being reactive, I'm glad to say that the Gentle Leader works fine with my two-dog leash.