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Covered vs uncovered litter box
The options
Open tray
A plain high-sided box with no lid, ideally about one and a half times the cat's body length.
Pros
Cons
Hooded or domed box
A tray with a removable hood, usually with a single front entrance and a filter.
Pros
Cons
Side by side
| Criterion | Open tray | Hooded or domed box |
|---|---|---|
| Odour in the room | More noticeable | Contained |
| Odour where the cat stands | Disperses | Concentrated |
| Litter scatter | Wider | Well contained |
| Multi-cat households | No exit to guard | Single exit |
| Senior and arthritic cats | Low entry possible | Roof restricts posture |
| Room for a large cat | Any size, including tubs | Limited by the hood |
Who the cover is actually for
A hood traps smell inside the box. That is the selling point and it is also the problem, because the cat has to go inside the concentrated smell rather than stand next to it. Scooped daily, a covered box is usually fine. Scooped twice a week, it is meaningfully worse than an open box on the same schedule, and the cover makes it easier to let the schedule slip because nothing is visible.
The second issue is escape. Cats prefer to eliminate where they can see approaches and leave in more than one direction, which is an instinct about vulnerability rather than fussiness. A hood has one exit, and in a multi-cat house one cat can control it simply by sitting nearby. Nothing that looks like aggression has to happen for the other cat to start going elsewhere.
Size matters more than the lid
Before choosing between covered and open, check the size. A box should be roughly one and a half times the cat's length from nose to tail base, measured inside. Most commercially sold boxes, hooded ones especially, fall short of that, which is why a plain storage tub with a low entry cut into one end is so often the better purchase.
- Two to three inches of unscented clumping litter, kept at a consistent depth.
- One box per cat plus one, sited in different rooms rather than lined up together.
- Away from food, water, noisy appliances and dead-end corners.
- Replace plastic boxes once the surface is visibly scratched, since scratches hold odour permanently.
How to choose
- Single cat, daily scooping, and litter tracked across the floor: a hood is a fair trade.
- More than one cat: open trays, and more of them.
- Cat eliminating outside the box: take the lid off first. It is the cheapest experiment available and costs nothing to try.
- Senior, arthritic or very large cat: open, with a low entry and plenty of internal length.
- Undecided: put an open tray beside the covered one with identical litter and let the cat vote over a week.
- What to skip: top-entry boxes for kittens, seniors, heavy cats or anything with joint pain, since they demand a jump and a controlled landing.