Size Information:
S - Back Length - 11.2-13.8 , Recommended weight - 8.8-16.5lb
M Back Length - 11.0-13.8 ,Recommended weight - 16.5-24.3lb
L Back Length - 13.0-18.1 ,Recommended weight - 24.3-38.6lb
XLBack Length - 17.1-22.0,Recommended weight- 38.6-55.1lb
XXL Back Length - 22.0-26.7 ,Recommended weight - 55.1-77.2lb
XXXLBack Length - 26.7-30.7,Recommended weight -77.2-99.2lb