[–] ProxyMusic 13 points Edited

Dogs know which kind of urogenital anatomy they themselves have as well. Dogs with penises pee differently to the way dogs with vaginas, vulvas and female urethras pee - and only dogs with penises go around mounting other dogs, humping human legs, and trying to fuck the furniture. Dogs sure can tell which other dogs have penises and which have vaginas too.

Part of the reason dogs clarify by putting their nose in our crotch. They’re absolutely guaranteeing our sex.