size     Back length       bust          Collar

XXS     16.5   26-28   18-20 Reference breeds: Chihuahua, Yorkshire small VIP

XS      19     29-31  20-22 Reference breeds: Chihuahua, Yorkshire small VIP

S       23    32-34   20-24 Reference breeds: Chihuahua, Yorkshire, VIP, Bomei

M       28     39-42  23-28 Reference breeds: Maltese, Shih Tzu

L       31    43-47   27-31 Reference breeds: Mini Schnauzer, Pug, Beijing dog

XL      35    46-53   30-34 Reference breed: Schnauzer, can be card