Comfort Harness from Super Pet (small) www.petsmart.com - $5.39 Product Description: This combination of a safety harness and stretchy leash allows you to take your small animal for walks to enjoy the outdoors and time outside his habitat. Adjustable harness features both Velcro fasteners and a snap-lock closure for extra security. Constructed of cool nylon mesh and soft cotton which is machine washable. Choose the small for pet rats and young ferrets; the medium for ferrets and guinea pigs; and the large for pet rabbits. All sizes are adjustable so you can achieve a perfect, individual fit. Please read all instructions before placing the harness on your pet. RattyRat's Review: This harness was horrible to try and put on and didn't fit a single one of our rats. This is probably the poorest designed harness we've ever seen.