I have two cats. They're a mother-daughter pair and are very closely bonded. Due to a lack of space upstairs (litter tray has to be upstairs due to the dog eating cat poo!) they share a litter tray. (I say litter tray- it's actually a huge underbed storage box)
They're absolutely not bothered at all - I've seen them both in there at the same time quite happily and there's never been any arguments over it.
A workman visited recently and made me out to be an animal abuser because of it - I need three litter trays apparently.
Wibu?