eneas, I think the biggest problem with a dirt floor is infection. If you are a person who knows how to prevent infection, then use dirt if you want to. Personally, I have seen people just put their dogs back up after just rinsing them off with a hose. That, in my opinion, is the WRONG answer. A person will take a good shower after sweating but yet just hose a dog off after a roll. I think the problem with dirt is probably traction and infection. Just me though.