Sitting in the back of the squad car, you wonder why he called you Butch. Sure, you're a dog now, but who would call a female dog Butch...
It finally hits you when you try to move around a bit and you bump your groin into something. Obviously, something is dangling down there. You turn your head between your forelegs to look at what is pulling at your crotch...and you see a large sheath and a big round dangling nutsack instead of the smooth crotch you're used to having. One thing is certain: dog or not, it's gonna be awkward having these things between your legs.