I just got my 20 mm cc brush today and tried it on all my animules. whiskey my yorkie actually rolled over and let me brush her tummy, chin, and back legs which she usually hates. My cats loved it-they would try to bite me every time i quit brushing them. my chi and weenie-rat rolled right over for their special belly massages.whooeee...my wrist is tired!! plus both my daughters tried it out brushing their hair and have told me they want their very own....guess i'd better get to ordering!!! I want to also order a comb so i can start trying to do topknots but not sure what size-i do want the rat tail kind though.