My dog has a little tuft of hair below her ribcage that sticks up like a little mohawk on her belly, she was laying on her back on the floor last week and my 6 year old nephew looked down at her and asked:
Nephew: Is Roxy a boy dog or a girl dog?
Me: She's a girl.
Nephew: Oh, it looks like she has a little dog penis on her belly.
Me: No, that's just fur
Nephew: Oh, I thought it was a dog penis
HAHAH He was so serious and non-chalant about it, I thought it was hilarious.