Does the Sheath the Covers a Dog's Flaccid Wang Have a Name?

You know how when a dog is sporting red rocket you can see his pinkish dong emerge from that little furry sheath that normally hides it? What’s that sheath called?



In horses, it’s called a penis sheath.
Rather unimaginative, but clearly descriptive.

Picture at labeled, as noted above, prepuce.

It’s clearly visible on buffalo nickels, as has been noted here before.