Yes — and for fancy mice, the workday question answers itself differently than for solitary pets, because a well-kept mouse is rarely alone in the first place. Female fancy mice are deeply social and should live in pairs or small groups, so the company that matters to them is already in the enclosure while you work. A single male, who must live alone because males fight, still handles the day well: mice are busiest at dusk and through the night, and they spend working hours asleep in a communal nest or a private one.
The checks that make the day safe
Small bodies and fast metabolisms mean the morning check is about basics, done properly. Confirm the sipper tube delivers water when touched — a blocked tube is the one failure that can harm mice within a day. Leave the day's food measured rather than heaped, with a little scattered in the bedding so the group spends waking hours foraging instead of squabbling over one bowl. Audit security with a mouse's body in mind: bar spacing must be narrow enough that the smallest mouse cannot push her head through, because where the head fits, a mouse follows. Check the lid clips and any tube connections, and keep the enclosure away from midday sun and draughts, since a small mammal overheats and chills faster than the room's occupants do.
What they do with the hours you are gone
A group of fancy mice fills the day with sleeping in a piled nest, short waking bouts of grooming and rearranging bedding, and bursts at the wheel and ropes toward evening. Enrichment is what separates a content group from a bar-chewing one: rotate cardboard tubes, egg boxes, and chew sticks; give nesting material they can shred and carry; and keep the wheel solid-surfaced and big enough that backs run flat. If you return to mice who are bright, sleek, and busy at dusk, the arrangement is working. Barbering — one mouse chewing cagemates' whiskers or fur short — repetitive bar biting, or a mouse who has gone quiet and hunched are the signs the group, the space, or her health needs a closer look.
Males, groups, and the exceptions
The one mouse who genuinely experiences your absence is the solitary male, and even he mainly needs your evenings: gentle handling once he is awake, time exploring a playpen, and an enclosure interesting enough to patrol. Never solve a male's solitude with a cagemate — adult males fight, sometimes fatally — so his human contact carries more weight. New, pregnant, nursing, elderly, or unwell mice are the real exceptions to the workday rule: they need a midday check on food, water, and condition, and a nursing mother needs her extra food reliably timed. Quarantine newcomers separately before introductions, since a workday is the wrong time for an unsettled group to sort itself out.
A routine the whole household can run
Mouse care fails most often through inconsistency — double feeds from two people, or a water check everyone assumed someone else did. Write the morning and evening jobs down once: water tested, food measured, a quick count of every mouse, and any hunched or bullied individual noted. Sharing that routine and the group's notes through KinsLe's Family Sharing keeps every helper working from the same details, so the mice get one clear routine no matter who is home first.