The Cat That Stopped Using the Litter Box After a Move
A nine-year-old spayed domestic shorthair, "Pia," has urinated outside the box four times in 10 days, always on a bathmat in the second bathroom. The family moved six weeks ago from a one-story house to a two-story townhouse. There are two litter boxes (both uncovered, both with the same clumping litter she used for eight years), one on each floor, but the upstairs box is in a closet next to a washing machine that runs most evenings. Pia is otherwise well: eating, drinking, and using the box for defecation. A veterinary visit three weeks ago found no crystals, no infection, and normal bloodwork. The owners have started scolding her and closing the bathroom door.
1. Build a differential list and explain which causes the evidence supports and which it does not.
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Differential list for periuria in a 9-year-old cat after a move:
- Medical - lower urinary tract disease, arthritis, hyperthyroidism, renal disease. Largely reduced by the recent exam and normal bloodwork, but not eliminated: a single urinalysis can miss intermittent disease, and arthritis pain climbing stairs is plausible in a 9-year-old. Recommend a recheck if the pattern changes or if she shows reluctance on stairs.
- Litter box aversion - supported. The upstairs box sits beside a washing machine running most evenings; the noise and vibration are aversive and unpredictable. The bathmat is soft, quiet, and in a low-traffic bathroom. Substrate and box type have not changed, so the novelty is location and noise, not litter.
- Location/preference - supported. She has chosen a specific, consistent site: soft, absorbent, private. This is a site preference, not random.
- Social/environmental stress from the move - supported as a predisposing factor. New layout, two stories, new smells, and a six-week timeline fit the onset. Defecation in the box argues against a global box aversion and points to a site- and floor-specific problem.
- Marking - unlikely. She is spayed, the deposits are full voidings on a horizontal surface, and there is no spraying posture reported.
The scolding and door-closing are the wrong interventions: punishment after the fact cannot associate with the act, adds stress, and closing the bathroom removes the site without providing an acceptable alternative, which often produces a new site.
2. Write the intervention plan, including how the owners should respond if they catch her in the act and what to change in the environment.
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Environment. (1) Move the upstairs box out of the laundry closet to a quiet, low-traffic spot on the same floor, and stop running the washer during her peak box-use times (typically after meals and waking). (2) Add a third box: uncovered, same litter, placed in the second bathroom near the bathmat, so the chosen site becomes legal. (3) Keep both floors' boxes scooped daily and fully changed on a schedule; do not switch litter. (4) Remove or block the bathmat temporarily (a plastic runner or a different-texture mat) so the surface is less appealing, but only after the new box is in place.
Contingency. Do not scold. If they catch her mid-urination, say nothing startling; calmly move her to the nearest box, and if she finishes there, quietly reward with a treat or praise. Clean soiled sites with an enzymatic cleaner - standard detergent leaves uric acid cues.
Enrichment and stress. Vertical space and scratching posts on both floors, predictable feeding and play times, and a covered retreat away from the washer. Consider a pheromone diffuser as an adjunct, not a substitute.
Measurement and review. Log every deposit with time, floor, and substrate for 14 days. Success = zero deposits outside the box in week two and continued use of the new bathroom box. If deposits continue despite full compliance, or if she shows stair reluctance or increased vocalization, return to the veterinarian for pain and urinary recheck before escalating behavioral treatment.