Seems like Tuck was just having a couple bad days with all of the small changes that seem so insignificant to the humans… I guess me coming back from vacation, having someone other than his walker walk him for a week and then changing back to the regular walker the next had him in a tizzy. He's not peeing anymore. I also strip tested him for several days during a week and the indicator never changed color, so I'm guessing I can rule out Fanconi for now, which would, of course, be the most extreme reaction from an overprotective parent. :)