Size chart for all Pattern Harnesses in cm. or (inches) except the Patrial harness.

Size
Neck CM (in.)
Breast girth CM (in.)
Back Length CM (in..)
xsmall
2 2 (8.7 )
24-34 (9.4 - 13.4)
8 -(3.2)
Small
26 (10.2)
32-48 (12.6 - 18.9)
9-(3.5)
medium
32 (12.6)
36-58 (14.2 - 22.8)
11-(4.3)
large
40 (15.75 )
48-72 (18.9 to 28.4)
13-(5.1)

Only the Dotty harness comes in an extra small