One tray shared between cats works until the day it quietly does not: a queue at a busy hour, one cat guarding the doorway, or puddles appearing beside a perfectly clean tray are the usual announcements. The fix succeeds when it arrives as an expansion of choice rather than a relocation of the one facility every cat currently trusts.
Start by Adding Trays, Not Moving the Familiar One
The target arrangement is one tray per cat plus one extra, so two cats need three trays in total, and the arithmetic matters because the spare tray is what ends competition at peak times. Buy or prepare the additional trays and set them out as additions while the original tray stays in its established place, untouched. Removing or moving the shared tray on the same day would force every cat to learn a new map at once, and cats register that kind of change as a loss; an added tray, by contrast, is simply investigated, tested and either adopted or ignored at each cat's own pace.
Put Added Trays in Quiet, Separate, Accessible Spots
Place each new tray somewhere quiet, genuinely separate from the others rather than in a row, and easy to reach without crossing another cat's resting territory or climbing over obstacles. Corners of different rooms work well; a spot beside a noisy appliance, inside a cupboard with a stiff door, or at the top of stairs an older cat now finds hard does not. Each tray needs an escape route, because cats feel vulnerable mid-toilet and avoid places where a housemate can corner them. Keep trays well away from food and water, in keeping with the separation cats themselves choose when they have any say in the layout.
Fill Every Tray With the Litter They Already Accept
Use the same accepted litter in every tray, at a similar depth, so the new trays smell and feel familiar from the first visit. Changing litter type during a tray transition confuses the experiment: a cat refusing a new tray might be refusing the contents, the location, or both, and you would have no way to tell. If a litter change is also planned, park it until the tray arrangement has settled; one variable at a time is what makes feline behaviour readable. Scoop the new trays as promptly as the old one, because a pristine shared tray will beat a neglected new one in every cat's estimation.
Watch Favourites for a Week or Two
Observe the pattern for a week or two before changing anything else, noting which trays get used, by whom, and at what times of day. Favourites usually emerge clearly: the quietest tray may serve every cat while a badly placed one stays untouched, which tells you to relocate the ignored tray rather than conclude that the extra is unneeded. A tray nobody visits after a fair trial in two different spots can be the one eventually retired, but that decision belongs at the end of the observation period, not the start.
Retire the Old Tray Last
Only once the new arrangement is carrying the household's traffic does the original tray come up for retirement, and even then, remove it while leaving the accepted trays in their proven places. If accidents appear after the removal, reinstate a tray at the old site and read the message plainly: that location was doing work the others were not. Care Teams, organised through KinsLe, shares the cleaning rota for every tray and stamps each completed clean in time order.