As a professional dog trainer I am continually researching a products to find the best and I believe I have found this with the Canny Collar and Canny Leads. The Canny Collar is by far the best product on the market to assist people with a dog that pulls on their lead as it brings the control back to the owner and not the dog in a gentle way! Canny Leads are also an excellent design, being both durable and very comfortable to hold when walking your dog.