Actually, it's dirt. After it rains and the ground is soft our little group loves to dig and eat dirt (we feed them, really we do) then they come in and there is no way for them to give the innocent look. Oh, they try, but as they look at me I can tell where they've been and what they've been doing. Can you tell who is who? By the way, these photo were taken as they came in the door one evening. And wouldn't you know there are storms in the forecast for this afternoon and tonight. Out come the towels and old sheets for those muddy paws and noses.