We highly recommend measuring your pet using the sizing guide below. Go up one size if they are in between sizes or if they have a lot of hair. Size below is for this fancy luxury dog clothes only. Sizes in inches

Chest and Length shown in inches
XXS 8" 5"
XS 10" 6"
S 12" 7"
M 14" 8.5"
L 17.5" 9.5"
XL 18.5" 10.5"
XXL 21.5" 12"
XXXL 23.5" 13"