Please check images for size chart!
S: Neck 11.8-19inch, Chest 17.3-23.6inch;
M: Neck 13-19.6inch, Chest 20.4-26.7inch;
L: Neck 18-23.6inch, Chest 22.8-32inch;
XL: Neck 22.8-34.6inch, Chest 31.8-41.7inch.
Measure your dog's Neck & Chest before ordering!