Dog Costume Size Medium - please select the correct size. NWT * designed for your pet's comfort and good looks * Velcros at neck *Adjustable * Hand Wash, Dry Low MED - Fits Length 14-17" Girth Circumference 19-23" LARGE- Fits Length 18-21" Girth Circumference 24-28" For LENGTH-- Measure your dog from base of neck to base of tail For GIRTH-- Measure around the thickest part of the dog's chest