Doesn't upset me if people mix mine up,I have one of each,I do get mildly irritated when people who have asked repeatedly still mix them up,but only from the point of view that I feel like I am wasting my breath! Plus my two often wear their collars with their names stitched into them and since the boy is called Alfie I am not sure how they can think he is a girl? His named collar is purple with white stitching ,Issy's is black with white. They have matching leads and I too am a little bit addicted to collar and lead shopping.I get cranky because they need martingale collars for walks and nobody seems to make these in anything other than plain colours. OH thinks it a total waste of money and would just buy purely practical stuff and frequently sticks non matching gear on them,when we go out locally people sometimes remark "we know who dressed these two today" LOL. I am drooling over the Ruthless collars and think they may be next on the list.