Chewy carries prime canine training leash brands like PetSafe leashes, Four Paws leashes, Flexi leashes and ThunderLeash. The Flexi training leash is a good training tool, because it’s easy to control. You can provide extra slack or reign in your pup quickly and with ease. The Four Paws coaching lead may look simple in comparability to other leashes, however it’s a great tool for leash training.