Ultra Paws Two Dog Tow Line Run two dogs side by side with this Two Dog Tow Line. The Tow Line is 8 feet long before expansion. Made of two sections of 1 inch tubular nylon with 12 inches of stretch shock cord inserted inside. The Tow Line includes a brass snap on each Line section to attach to the back of your dog's harness. A loop at the combined end attaches to your Ultra Paws Skijor Hip Belt or sled.