Alfie Pet by Petoga Couture - Oliga Backpack Harness with Leash Set Size Medium best fits breast girth: 18"-21". Backpack: 6" length, 3.5" width and 7.5" high. Leash is 43" long. We highly recommend you measure your pet precisely with a flexible tape measure to ensure the best fit. Contact us if you have question. We are happy to help. Functions as both a harness and backpack. Comes complete with a leash. Feature a sturdy D-ring for easy leash attachment. Hand wash recommended. Perfect for everyday walk and weekend party, or just making your pet look its best.