Hi all, I have three cats. Two cats go outside to the toilet. The other one won't go outside and when he is outside he will come inside to poo in the litter tray (we have one litter tray for emergencies as we don't allow them out after dark). He won't, however, pee in the litter tray and just pees on the floor/against the door! He's been 'done' and is still doing it. Seems fine and healthy but just won't toilet outside! Does anyone have any advice please? Thanks in advance