Thank you for the great product ofr my huge Bully. He's taken it well and wears it without problems. Now he is walking in it obeying the rules and we both enjoy the walking. The collar is top quality and thought it looks like a torture I tried it on myself first and now I'm sure it is safe. Thank you also for the quick delivery. I recommend it for those who have tried all other means like me without success. But I would recommend to train in usage first to do it properly, though YouTube tutorials are quite enough to make use of it.