Abstract: The invention is a portable dog run which effectively exercises a dog or other animal. A cable, wound around a spool, provides an overhead linear guideway when extended. Also, a spool lock is provided to affix the cable at a predetermined length. The spool and extended cable connect to various fixtures by using swivel snaps and eyebolts, or other similar connectors. Adjustable straps are provided to connect the dog run to structures which do not accommodate eyebolts, hence enhancing the portability.