Ninja Collar Size Chart

Pet Type	Size	Neck Size
Cat	One Size Fits Most	8.5-12" (20-30.5 cm)
Dog	Extra Small (XS)	8.5-12" (20-30.5 cm)
Dog	Small (S)	11-15" (25.5-38 cm)
Dog	Medium (M)	15-20" (33-51 cm)
Dog:	Large (L)	18-26" (41-66 cm)