Start with the skin under the patches
A rabbit losing fur in patches needs the skin examined before any cause is assumed, because the same bare area can be harmless or medical depending on what lies beneath. Smooth, calm skin with short new growth coming through often fits a heavy molt, which in rabbits can look dramatic and uneven. Flaky, dandruff-like scaling, crusting at the ear edges, red sores, or fur that comes away with scabs points toward parasites, infection, or scalding that needs a vet's identification.
Mites and other medical causes
Fur mites commonly produce scaling and thinning along the back and around the neck, with the rabbit scratching more than usual, while ear mites add crust inside the ears and head shaking. Bacterial or fungal skin problems tend to produce soreness, odor, or spreading crusts rather than clean thinning. A patch over a lump, a wound from a fight, or fur loss around a wet, urine-soaked rear each has its own cause and urgency, so location matters as much as appearance when you describe it.
Barbering, bonding, and fur pulling
Bonded rabbits sometimes over-groom each other, leaving neat short patches on a partner's back, head, or shoulders while the skin stays perfectly healthy, a behavior called barbering that often reflects boredom, stress, or hierarchy. An unspayed female may pull fur from her chest and belly to line a nest, including during a phantom pregnancy, which is a very different pattern from back scaling. Watch the pair interacting for an evening before separating anyone, and note which rabbit's fur is short and which rabbit is doing the grooming.
Molting patterns that are normal
During a molt, rabbits shed in waves and patchy bands, sometimes leaving tide lines across the body, and the process can look alarming in a heavily coated breed. Gentle brushing removes loose fur, reduces what the rabbit swallows while grooming, and lets you see new growth confirming the cycle. A molt should progress and regrow over weeks; patches that stay bare, spread with scaling, or appear outside a molt pattern should not keep being attributed to shedding.
Grooming help during a heavy patchy molt
During a confirmed molt, short daily brushing sessions on a non-slip mat remove loose fur before your rabbit swallows it, and let you feel for new lumps, sore spots, or parasites hidden under the remaining coat. Work in the direction of growth, stop if the rabbit thumps or struggles persistently, and never pull at fur that resists, because attached fur over sore skin tears easily. Pair brushing with a handful of hay afterward so the routine stays positive, and note any area where regrowth lags behind the rest, since a single stubborn bare patch deserves its own check at the next vet visit.
When patchy loss needs a vet visit
Book a vet if patches come with flakes, crusts, sores, scratching, ear debris, weight change, or a sore wet rear, or if barbering is breaking skin between companions. Photograph each patch with its location noted, and bring details of companions, recent stress, and housing changes. Logging those patch maps in your KinsLe Pet Passport means a returning pattern, molt or mite, is recognized quickly next time.