Why do animals who live underground appear always clean and not full of dirt? (e.g. worms, mice, rabbit)

Question

Why do animals who live underground appear always clean and not full of dirt? (e.g. worms, mice, rabbit)

In: 7599

Answer 1

I have often wondered how the white part of my dog stays so white his head and part of his shoulders look bright white in the sun. I feel like texture of that fur is the husky in him. But, he stays remarkably white even though he rolls and rummages through everything.