Measure the circumference of your dogs leg. The circumference is about equal to the width of each wrap but because of the thickness of the neoprene and the support stays you will typically need to order a size or two larger then the circumference of your dogs leg.
Some examples are:
Australian Shepards usually need a Large
Labrador Retrievers usually need an XXL
Shelties usually need a Small or Medium.
If you are still unsure what size to order please contact Canine Icer, LLC and we will be glad to help.