We have a busted sprinkler thingy in the backyard so there's a small mud puddle. On hot days they get into in (actually, P.C. lures Smokey into and then doesn't get in it himself) and I think I have a brown dog.
It's so funny cuz I'll come home and go to the sliding glass door and look out for P.C. and Smokey... and I always laugh my ass off when they appear - dirty as all get out! They always have mud rings on their noses. It's so funny. I need to take pictures next time they decide to be Mud Puppies.

The aftermath - P.C. LOVES baths, Smokey - not so much.