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Measure the Chest Size From Over the Top of the Shoulders Down Around the Chest Just Behind the Front Legs.
S for Dogs about 30 lbs-Chest Size 17 to 21 Inches
M for Dogs about 45 lbs-Chest Size 25 to 31 Inches
L for Dogs about 65 lbs-Chest Size 21 to 26 Inches
XL for Dogs about 85 lbs-Chest Size 30 to 36 Inches