A little bit of mud won't do shit, but if your doing it all the time it will wear down your edges a tiny bit. but doin't worry.
"pee on the zombies, because not even zombies want pee all over them" - ktwofreeskier
"Never before in my time at the bar or on the bench have I ever had to deal with somebody who voluntarily allowed himself to be buggered by a dog on the public highway. Frankly it is beyond most of our comprehension" - British Judge