The short answer for a Flemish Giant
A Flemish Giant's skin and fur should be checked carefully once a week, with quick hands-on contact during daily handling in between. Weekly is the right rhythm for this breed because the sheer area of a giant rabbit's coat can hide a developing problem for a long time, and Flemish Giants also shed heavily in seasonal waves that change the coat's condition quickly. A careful check means parting the fur to see skin, not stroking the surface. During moulting weeks, step the careful check up to twice a week, since loose fur mats fastest exactly when the coat is turning over.
What a careful check means on a giant rabbit
Work over a Flemish Giant in sections while the rabbit rests on the floor, parting the coat with your fingers along the spine, flanks, belly, chest, and the warm hidden fold around the tail and hindquarters. You are looking at the skin itself: it should appear pale and calm, without heavy flaking, crusting, redness, or tiny dark specks that suggest mites or flea dirt. Run your palms flat over the body as well as looking, because lumps under that acreage of fur are felt long before they are seen. Check inside the ear edges and under the chin, two spots owners of big rabbits commonly skip.
The areas this breed's size puts at risk
A Flemish Giant's weight presses through its hind feet and hocks, so part the fur on the underside of the hind feet and look for thinning, redness, or broken skin at every weekly check. The skin under a heavy dewlap and along the belly sits close to bedding and litter, so lift and look rather than assuming it matches the clean back. Around the tail and scent glands either side of the genitals, waxy buildup and matted fur collect unnoticed on a rabbit too big to groom every corner easily. A Flemish Giant that cannot comfortably reach its rear also leaves caecotrophs stuck in the coat, which draws flies in warm weather if not cleaned away.
Daily handling still counts between checks
The weekly careful check sits on top of daily contact, and a Flemish Giant should be stroked, lifted correctly, and observed eating every day. Daily handling teaches you the normal feel of this particular rabbit's body, which is what makes a new lump or a rough patch obvious at the weekly check. Notice appetite, droppings, and willingness to move across the floor, since a giant rabbit hiding skin discomfort often shows it first as reluctance to shift its weight. Grooming loose fur out twice a week during a moult also doubles as informal inspection time. None of this replaces the deliberate part-the-fur session; it supports it.
What to do with anything you find
Small findings get noted and rechecked within days: a mild flaky patch, a single small scab, or a patch of thinning fur over a hock. Take your Flemish Giant to a vet when skin is broken or weeping, when patches spread between checks, when the rabbit scratches persistently, or when you find a lump that grows, changes, or bothers him. Moulting bald patches that show healthy skin and regrow evenly are normal for this breed and simply need watching. Photograph a questionable area beside a coin for scale if you want the vet to judge its progress, and write down when you first noticed it.
Making the weekly check actually happen
Anchor the Flemish Giant's careful check to a fixed weekly moment, such as the full enclosure clean, so it is a habit of the household rather than one person's good intention. Two people make it easier on a rabbit of this size, one keeping him settled with treats while the other parts the coat. Findings worth sharing, like a hock that looked thinner this week, should not live in one person's head. Putting the weekly check on the rota in KinsLe with Care Teams, where each completed check and its notes are timestamped, means this Flemish Giant's skin gets watched by the whole household, week after week.