I am really pleased with this product. I have a very large Bully and he took the collar rather well and worn it willingly enough. Now he walks obediently and I enjoy our outings. He is tired and happy after them. The product is of very good quality and although it looks cruelly, I tried the collar first on me to be confident. I received the collar in a heartbeat. I would recommend it to everyone who tried all other methods and had no success, as I did. I would strongly recommend practicing before use, although careful study on YouTube may be enough to learn how to use it helpfully for your dog and you.