Answered by GWL, May 22, 2014 at 07:31:26 PM EDT.
A: It is hard to say as dogs come in more shapes and sizes than any other animal on the planet and the weight can be distributed so very differently, even amongst dogs of the same breed however I will provide the manufacturer's measurements and hopefully it will help.
-XS is for dogs up to 10 pounds with a 5-13" head strap, 3-7" chin strap, and a frame size of 3.5"
-SM is for dogs 9-25 pounds with a 12-20" head strap, 4-8" chin strap, and a frame size of 4.75"
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