The sitter scenario is where this list earns its keep most directly, because the sitter is in her house, on her territory, with every one of her hiding places present and in use. A cat who vanishes for an afternoon is a normal cat, but a sitter who does not know that can spend the afternoon in rising panic, opening doors that should stay shut, moving furniture, and frightening the cat they are trying to find into hiding more deeply. Your update before the stay exists to break that cycle in advance, giving the sitter her map, her timetable, and a calm order to work in, so a missing-looking cat is a checklist item rather than an emergency.
The Order a Sitter Should Search In
Write the list in search order, not in the order you happen to remember the rooms. Lead with her usual sleeping and hiding spots, room by room, any new favorites, and the places she must never be shut into, including cupboards and the garage, and put the high-probability spots first: the bed she sleeps under daily outranks the spare room she entered once in spring. Beside each spot, describe how to check it properly, since cats are missed by people who glance rather than look: shine a light behind the washing machine, lift the duvet rather than patting it, open the wardrobe and wait a moment before deciding it is empty. Note the spots she uses specifically when a stranger is in the house, because a sitter is, to her, exactly that, and the place she chooses for visitors may be one she never uses when only you are home. That single distinction, her visitor spot versus her everyday spot, prevents most sitter panics on its own.
Her Timetable Is Half the Map
A place list without times misleads, because she is not equally findable all day. Add her ordinary rhythm beside the rooms: where she is at breakfast, where she disappears to after it, when she reappears for the evening, and which absences are so routine that the sitter should not even begin the search until they have lasted longer than usual. Be honest about the gaps in your own knowledge too, and mark the stretches where you yourself rarely see her, because a sitter reassured that the owner also loses her every afternoon will trust the list instead of their fear. Walk the route together before the stay, at an hour when she is likely to be hidden, and let the sitter find her once with you present, since one successful calm search teaches more than any amount of written reassurance. Confirm the terms of the stay in writing during the same visit, covering payment, tasks, and what the sitter should do if she genuinely cannot be found, so the unlikely case is agreed while everyone is relaxed.
When the Search Genuinely Fails
Give the sitter an ending for the story as well as a beginning: after two slow passes through the list, the shut-in places checked, and food put down with the house quiet, the next step is a call to you, not a wider and louder search. A cat who is ill or trapped often answers quietly, and a house searched calmly twice will reveal sounds that a frantic search drowns out. Ask the sitter to note where she was eventually found each time, and update the list from those notes when you return, because a sitter's finds are genuine data about how she uses the house with other people in it. Spots can then be promoted, demoted, or retired in the order, and the list sharpens with every stay instead of aging. Preserved that way within Pet Passport, KinsLe's packet for her records, the list the next sitter receives has already been tested by the last one.