How to Measure:
Girth (Red): Around the chest behind the front legs
Chest Strap (Blue): Around the chest
Neck (Green): Around the neck
Small
Girth: 24 inch to 30 inch (62 cm to 77 cm)
Neck: 18 inch to 25 inch (44 cm to 64 cm)
Chest: 23.5 inch (60 cm)
Medium
Girth: 30 inch to 35 inch (77 cm to 90 cm)
Neck: 26 inch to 34 inch (66 cm to 86 cm)
Chest: 26 inch (67 cm)
Large
Girth: 31 inch to 40 inch (80 cm to 102 cm)
Neck: 28 inch to 35 inch (71 cm to 89 cm)
Chest: 28.75 inch (73 cm)
X Large
Girth: 39 inch to 51 inch (99 cm to 130 cm)
Neck: 28 inch to 35 inch (68 cm to 90 cm)
Chest: 30 inch (77 cm)