If you are unsure of the size, please measure the size of your dog as shown in the picture. Measured correctly, please consider dog hair loss and hair growth period of measurement error, and not according to the pets weight for size reference.
S: Collar 12- 15 Harness:12-18
M: Collar 15- 18 Harness:16-24
L: Collar 18- 22 Harness:24-30