My run is currently dirt. Which is fine in the summer. But in the spring it is a muddy mucky mess when the snow thaws. Not to mention it smells like a chicken coop when muddy as well. I was thinking of putting road base in to cut down on the mud. It's a sandy base with large gravel in it. It packs down fairly tight but still drains really well. We used it in our dog kennel and it's worked great. Has anyone used anything similar in their run?