Jas Leverette primarily uses prong collars in his training methods. Prong collars are also known as pinch collars and consist of metal links with prongs that gently tighten around the dog's neck when pressure is applied. These collars are designed to mimic the way a mother dog corrects her puppies by applying pressure using her mouth. Jas believes that prong collars can effectively establish clear boundaries for dogs and aid in controlling undesirable behaviors.