Feliway
A plug-in diffuser that copies the facial pheromone cats use to mark a place as safe — the standard first-line support for spraying, tension and move-stress.
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When cats spray, over-groom or wage cold wars with housemates, the trigger is almost always environmental insecurity. Feliway's diffuser vaporizes a synthetic copy of the facial pheromone cats deposit when they bunt (rub their faces) on furniture — the species' own "this place is safe" signal. Humans smell nothing; the cat reads the room differently.
Rule out medical causes with a vet first (sudden spraying can mean urinary disease — that is urgent, not behavioral). Then Feliway is the standard non-drug step: one diffuser per problem room, plugged in low where the cat spends time, refilled monthly. Multi-cat tension? The dedicated Feliway Friends formulation targets that conflict specifically.
This is the most research-backed calming product in the category, and it still is not magic: it works well for a majority of cats, partially for others. Use it as the calm backdrop while you fix the real levers — litter box count (n+1), resource separation, vertical space. For new-cat introductions and house moves, it noticeably shortens the rocky period.
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