Note that this product is an extra leash for the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/The-Buddy-System-Hands-Free-Leash-Regular-Dog-System-Black-Regular/dp/B0002ZAZLC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">The Buddy System - Hands Free Leash - Regular Dog System - Black Regular</a>&nbsp;which is sold separately. The below is a review of that product. As for this extension, I don't have a second dog but find it handy for leaving one leash on the belt and having another I can use in situation where I want to leash the dog by hand or to a pole for a few minutes. It is useful having two. Originally I bought this one by mistake trying to buy the full system that includes the belt, but I'm glad now to have two leashes for the system.