Well, just as a taster of his mischief, when I came in from the midnight church service I rushed upstairs to wish Spenser a happy Christmas and check he was alright. He greeted me by lifting his tail and doing a wee! And no, the wee wasn't in his basin. At least it was on one of his towels, I suppose.
This afternoon I was on the phone to his Auntie McFlurry, and he moved his basin into the middle of his crate and did a wee behind it. It was quite a small wee so I don't think he really needed it, and am quite sure it was deliberate naughtiness.