He's not in trouble, he was investigating his daytime quarters. I swept out their den under the stairs and washed their bedding. Somebody has been stealing tomatoes. Whoever it is doesn't eat them, just plays with them before leaving them to fester. I found two in their crate and one under the sofa. Weird dogs. No wonder we had a hungry mouse visiting.
In case anyone is anti-crate, they don't get locked in apart from meal times. Emily and Storm eat in one each because they are slow eaters compared to the greedy beagles.