I have a 30lb Jack Russel mix, short legs but very strong. She is used to wearing a harness and pulling me on a bicycle so shes become conditioned to pull. Brought her out for a test walk and omg it worked instantly! I didnt need to jerk it or give any corrections. Whenever she started to pull, she stopped on her own. She learned right away that she couldnt run ahead of me. Nothing else worked so this was my last hope.

I have a young, deaf, pink skinned, long necked, half boxer dog with reactivity and deaf dog sensitivities. We tried everything from regular martingales to watch chain type pressure collars, vibration collar and even the regular sharp ended pinch collar. I had gone to a behaviorist that recommended a harness, (and a ton of guilt about the other collars), but the harness left me without control, (and a concussion when I was caught off balance and fell). My deaf dog needed something that would not incite her reactivity and translate the signals I was sending down her leash calmly and gently, yet hold her securely. The trachea spacer is perfect, the way the martingale portion stays at the back of her neck and operates is genius, and now she comes running to have her collar put on. No more pulling, lunging or biting at the leash. We are enjoying long loose leash walks together and she is back to her auto sit when I stop. The best part is that she is safe, and happy, and with the smallest movement of my wrist, I can get her to look at me for hand signals. Take the time to measure and fit it properly and take advantage of the assistance offered - it has been a game changer for us.