Because handmade items very in size, I have sized my dog clothes according to the following chart. I am using the exact measurements of the items laying flat with NO stretching which leaves room to grow. Example: If your dog's girth is 11.5 inches, it would fall into the X-Small size group.
Size                   Girth,
XXX-Small          6-8 inches,
XX-Small            8-10 inches,
X-Small              10-12 inches,
Small                 12-14 inches,
Medium              14-16 inches,
Large                 16-18 inches,
X-Large             18-20 inches,
XX-Large           20-22 inches.
Please measure your dog to determine what size will be most suitable.

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