Why moult mats form from the bottom up
A long-haired rabbit carries a fine, dense undercoat beneath longer guard hairs, and during the moult that undercoat is being shed in quantity while new growth pushes through. Loose undercoat hairs do not fall away cleanly in a long coat; they catch on neighbouring hairs, and every movement of the rabbit works them tighter, especially where the body folds or rubs — behind the ears, under the front legs, along the belly and skirt, and around the tail. The result is a felted mat that grows from the skin outward while the surface, brushed flat, looks deceptively tidy. That is why owners are often shocked to find solid mats under a coat they thought they were grooming: they were grooming the roof while the problem formed at the foundations.
The layer method that actually prevents mats
Part the coat with your fingers down to the skin — you should be able to see a clean parting line — and comb only the hair below your parting fingers first. Hold the base of the section gently so the comb does not tug the skin, use a wide-toothed comb to open the layer, then a finer comb to clear shed undercoat, and only then move up to the next layer. Work in palm-sized sections and accept that a full rabbit takes several sessions across a day or two; draw yourself a mental map — left side, right side, back, underside — and complete the circuit, then start again while the moult lasts. During the heaviest shedding weeks, a daily pass over the highest-risk zones matters more than a weekly marathon over the whole body. Keep a small pair of blunt-ended scissors aside only for snipping out a felted tip you truly cannot tease apart, with a comb slid under the mat as a skin guard.
Reading the coat as you go
Combing in layers doubles as your best skin check at exactly the season problems hide. Healthy skin under a moulting coat is pale and smooth with short new growth visible; watch instead for dandruff that walks or crusts at the ear edges, red patches, tiny scabs along the back, or a mat under which the skin is damp and smelly. Those findings are veterinary, not grooming, territory — mites and fungal skin conditions both exploit a thick moulting coat. Also feel body condition as your hands move: ribs and spine become easier or harder to feel as weight changes, and a rabbit eating less because of the discomfort of a heavy moult needs that noticed early. Combings should come away with loose wool; if you are instead pulling out tufts that leave thin patches, ease off and seek advice.
Diet and environment during the shed
A moulting rabbit is swallowing more of their own fur with every self-groom, so hay intake is protective: unlimited fragrant hay, refreshed often, keeps the gut moving and helps ingested wool pass. Keep water bowls and bottles checked, house the rabbit so shed wool does not build up in corners and bedding, and avoid bathing or wetting the coat to loosen mats — a wet long coat felts faster and leaves the rabbit cold, achieving the opposite of what you want. Bonded partners may groom each other enthusiastically during a moult; watch that mutual grooming is not stripping one rabbit's coat in a patch, and separate grooming help — your comb — should be shared between both animals.
Staying ahead until the new coat is through
The moult ends when combings come away nearly clean and the new coat lies at an even length; until then the daily layer routine is what stands between your rabbit and a dematting session under sedation, which is the outcome for severe felting. If someone else shares your rabbit's care, that rhythm only works if the sections done are recorded rather than remembered. KinsLe supports exactly that shared map through Care Teams, where each grooming session on your rabbit's profile can note the areas completed so the next person continues where the last left off.