Use This tutorial to choose the right size for the Canine. Measure throughout widest part of the paw when bearing excess weight. If in between sizes, measurement down. Dogs can have larger entrance paws than rear paws - evaluate all paws. The Wetland boot is a wonderful choice for 12 https://www.wanderlustprogear.com/products/4pcs-set-waterproof-pet-dog-shoes-anti-slip-rain-boots-for-small-cat-dogs-foot-cover-footwear-puppy-booties-pet-paw-accessories