Bought the boys a new tray. They prefer to share. Whilst I'm getting them used to the new one, I've kept the old one in place. They are both lidded trays, with flappy doors. New one been in place for a couple of weeks. I sprinkled some used litter in it.
Little M goes in there a lot, but just to fling litter about. No deposits. They haven't been using the original tray much either. They're spending more time outside during the day though, as the weather's better, and they prefer to toilet outside.
Today swapped them around, so new litter-box was in the place of the old one, iyswim.
I'm worried it may be freaking them out, and causing them to not pee, therefore causing a UTI.
Am I just being a worry-head? Or if anyone has any tips to encourage a cat to use a new tray/box, I'd be ever so grateful to hear them.