
I bought size L based on my dog's chest size (17.5") and back (14"). It weighs just under 14 pounds. Don't buy a coat based on the dog's weight alone - my other dog is 17 pounds and would never fit him as his chest is 19 inches and his back is 16 inches. It fits my little dog, the one in the photo. It's just a little hard to put on and even harder to take off. Hopefully he wouldn't mind putting on a coat over it.

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