Measure your dog's neck circumference and the chest circumference just below the front legs, then add 2 extra centimetres to the result.

If you're between two sizes, always go for the larger one.

  Neck Circumference (below the front legs)
XS 9.4 - 11.8 in
 14.6 - 16.9 in
S 10.6 - 13 in
 16.5 - 18.9 in
S/M 11.8 - 14.2 in
 17.7 - 20.1 in
M 13 - 15.4 in
 19.7 - 22 in
L 14.2 - 16.5 in
 21.7 - 24 in