Size are listed Height x Width   0# = 35 mm height 28 mm width.    We suggest placing your dog's paw on a piece of paper.   Draw a line on each side of the paw, remove the paw and measure the distance between the lines.   This will be your reference for the size.   Choose a size as close as possible to this size below the measured number.   

These socks are designed to give your dog some protection from the elements.  They are not designed to be used for rough terrain.  They are the equivalent of slippers for dogs.    The advantage of this type of footwear is the dog will easily adapt to walking in these, relative to a heavier or stiffer type of boots.   

We will accept these for exchange of a size only under specific circumstances.  Once they have been used outside, they are no longer a returnable item.  We suggest testing the size indoors in a clean environment.  If we determine they are no longer sellable as a new item, they will not be returnable or exchangeable.