I have two white bunnies that love to go outside during the day. We have a lot off trees in the back yard which they run around and dig at and get covered in tree sap which of course gets covered in dirt. I brush their bodies, but they will not let me near their heads which look auful dirty. They are very happy fat boys, but I can't keep them clean for nothing. Pudge is so dirty I dont know what to do with him. We have tried to keep them away from the trees and dirt, but it does not work and I would hate to keep them inside all of the time as they have a great time outside. Should I be as concerned as I am or not worry about it so much as long as they are happy and healthy?