I am always amazed by Rumo's cleanliness.

Go for walk, muddy paws after walk...by morning, the paws are snowy-white again.
Got some dirt on his snout...a few hours later, after licking paw and grooming his face with it, his face is snowy-white again.

And the funniest cleanliness of all-
we were walking through the park on a damp day -
I asked Rumo to sit...and he REFUSED. He kind of squatted, but wouldn't actually put his butt on the ground?
I was puzzled, because he never defies me when he 'understands' the command, and Sit is one he knows very well!
Then I realized that he did not want to get mud on his snowy-white butt!!  
For example, today (a dry day) he executed a perfect front-facing sit in the street...

He is so funny about staying clean!

Mars is always grooming himself (he could be a cat) too and doesn't like rain. But, one day we made the mistake of taking him to the dog park soon after some rainy days. He played, ran around and had lots of fun, but he also got hot. In the park there was a ditch (has been removed) right in the middle that was full of thick muddy water.  Well, the next thing we know he went into the ditch water head first, and rolled around in it (he was so happy)--it took three shampoos to get the mud off.   Needless to say, no more park visits after rainy days.

My female keeps things pretty neat and tidy. My male makes sure his feet are clean but the rest of him he isn't as concerned about....unless he's gotten a bath. Heaven forbid the water on them be clean water, then they must get it all off.

@PollyR wrote:

In the park there was a ditch (has been removed) right in the middle that was full of thick muddy water.  Well, the next thing we know he went into the ditch water head first, and rolled around in it (he was so happy)--it took three shampoos to get the mud off.

Whoa! It must feel great though, on a hot day!
Rumo does have the bad habit of trying to drink from puddles like that on hot days... (yich).