Size Chart
S: Webbing width: 0.6", Neck Girth: 9.8"-15", Chest Girth: 14.5"-19.6", Weight Recommended: < 33lbs
M: Webbing width: 0.78", Neck Girth: 13.7"-19.6", Chest Girth: 18.8"-26", Weight Recommended: < 66lbs
L: Webbing width: 1", Neck Girth: 17.7"-25.5", Chest Girth: 23.6"-33.4", Weight Recommended: < 99lbs