Size Chart
Neck
Chest
Weight
XS
7-9"
11-13"
2-3.5lbs
S
9-10"
13-15"
4-6lbs
M
10-13"
15-17"
6-9lbs
L
13-15"
17-19"
9-12lbs
XL
15-17"
19-23"
13-18lbs