Cat Litter Tray Design and Welfare

The litter tray is a critical resource for indoor cats, and its design, location, and maintenance significantly affect both physical health and psychological wellbeing.

Key Facts

The recommended litter tray size is 1.5 times the length of the cat — most commercial trays are too small
Covered trays may trap odors and make cats feel vulnerable to ambush — many cats prefer uncovered designs
Litter trays placed near food or water reduce usage, increasing risk of periuria (urinating outside the tray)
Cats prefer fine-grained, unscented, clumping litter in studies comparing litter type preferences
Litter trays should be scooped at least once daily — cats often refuse to use soiled trays
Location matters: trays in high-traffic, noisy areas are avoided and contribute to inappropriate elimination

Welfare Considerations

Inappropriate elimination (urinating or defecating outside the tray) is the most common behavioral reason cats are surrendered to shelters in the US. In most cases, the problem is not a character flaw but a logical response to inadequate litter tray provision. A cat that avoids its tray because it is too small, too dirty, wrongly positioned, or covered in scented litter is making a rational decision — the tray fails to meet its needs. Understanding this shifts the responsibility to the owner to get litter tray provision right, preventing unnecessary suffering and abandonment.

What You Can Do

Upgrade to larger trays (minimum 45x55cm for adult cats) if using standard commercial sizes
Try uncovered trays if your cat has elimination problems with covered ones
Scoop at least once daily and do a full litter change weekly
Place trays in quiet, low-traffic locations — never near food or water bowls
Add extra trays if you have multiple cats, following the N+1 guideline