I agree with the comment that it really doesn't bother me much, all my furbrats wear purple, it goes so beautifully with both sets of coat colors!.
Sequoia is a bit thicker and heavier than Rusty they assume she is the male for about 30 seconds. Then she sits to be pet, and they surreptitiously check . Rusty is such a soft boy I don't think it bugs him , cause he is a Mama dog to the max anyway(if it's small ,furry or squeaking it's going to be adopted cleaned and loved is his motto) Goofy is small for a cocker anyhow so she is usually guessed right. I myself am used to making the mistake as I tend to assume they are all girls, so now I just ask them while petting (so their human can answer and spare me embarrasment ) "You are such a darling baby! what is your name honey pat pat pat are you you a good boy for mom or a great girl ? patpatpaptpatpat" Usually the owner will reply which it is.
Btw Bmom don't care if Hottie is a boy, he is still a beautiful baby! (i thought he was a girl too in the head shot in siggie )