Size	Weight	Chest Girth
XS	12 LBS – 20 LBS	15" – 19"
Small	16 LBS – 26 LBS	19" – 24"
Medium	30 LBS – 50 LBS	24" – 29"
Large	50 LBS – 65 LBS	29" – 33"
XL	65 LBS – 80 LBS	32" – 36"