
For reference, my dog's measurements are: Neck 6.75" Chest 12" Back Length 12" Front Leg Length 6.75". I've attached a photo of her in a coat so you can see how she sits in a size XS. The coat is made of Thinsulate so you get warmth without bulk. Some of the dog coats I've seen look like down jackets and my dog would have a hard time walking in them, but that's not a problem. There is a hole in the back for a leash/harness which is a plus. I also like the stretch fabric around the arms and waist, I think it helps keep them warm. Before this coat, my dog was wearing a sleeveless winter coat, so on this coat she rolled the sleeves up first - she didn't want that. did not bend her legs when walking. But after a week or so she got used to it and is walking normally and now she seems much warmer.

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