I can't believe that there are actual adult people out there who cannot tell the difference between a male and femal puppy. In the past few days I have seen two cases of folks who just don't have a clue.
First one, a chihuahua puppy, came in for a nail trim with practically the whole family...they just got the puppy and wanted to name "her" after the lioness in the Lion King, but they couldn't remember her name, so we told them and "her" name became "Nala". So my pather takes the puppy, puts it on a table and starts slipping the pup into the grooming loops. With the puppy raised, on the back paws, I saw that "Nala" was in fact, a He. They were slightly embarrassed...they said that they thought it was some sort of little lump that was just going to drop off....or perhaps it was a nipple. Well, now they had to think up a new name.

Second one...woman (early thirties) brings in a puppy (another chi...very popular here) in a bag. She says that she wants to have a baby, but her mother told her to try a dog first, so she goes and buys a puppy at the flea market. She kept referring to the pup as "he". She was in what I call "puppy shock" brand new pup in the house and not quite sure what to do with it...she was asking about housebreaking, and if it was okay to leave "him" home alone for 12 hours while she was at work. (duh) So I'm going to clip the nails on the pup, we get the pup out of the bag, look at the belly, and tell her that "he" is a "her". She points at the pup's little nub tucked between her back legs and says, "But that" a penis" "No," I say, "it's a vulva". She insists that it is a penis, and I have to repeat that it is indeed a vulva and that penii are higher up on a dog's belly. I think I finally had her convinced. Poor pup...I wish I could just take dogs away from people and tell them they are just too stupid to care for a dog.