Rabbit dandruff and flaky skin: fur mites, and the cause behind them

Quick answer

Flakes along a rabbit's back are rarely dry skin. The usual cause is a fur mite that lives on most rabbits at low numbers and only becomes visible when the rabbit stops grooming that part of its body. That is the point most owners miss: the mite is the symptom, and the real question is why the rabbit can no longer reach its own back.

The answers are almost always dental pain, excess weight, arthritis or spinal disease. A rabbit with scurf across the shoulders and rump, and a clean, well-groomed face and front, is telling you it cannot turn and reach any more. Treating the mite without finding that reason gets you a clean coat for a few weeks and the same problem again.

Part the coat over the shoulders and along the spine. That is where the flakes appear first.

• Flakes concentrated over the back and rump mean the rabbit cannot groom there. Look for the reason.
• Rabbit fur mites are transmissible to people and cause an itchy rash, usually on the forearms and trunk.
• Never use a flea product containing fipronil on a rabbit. It has caused deaths.
• Never wet-bathe a rabbit. Rabbits chill, panic, and fracture their own spines struggling.
• A rabbit with skin disease and a soiled bottom is at real risk of flystrike in warm weather.

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Never apply fipronil to a rabbit.

Fipronil is the active ingredient in several common spot-on flea products for dogs and cats, and it has been associated with severe neurological signs and deaths in rabbits. Do not use it, do not use a partial dose of it, and do not use a product intended for another species without asking a rabbit-experienced vet first. Several other insecticides sold for household or garden use are also dangerous to rabbits. There are safe and effective prescription options; ask for one rather than improvising.
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Decide in 60 seconds

Why the pattern on the body tells you the cause

A rabbit grooms in two different ways. The face, ears and front are cleaned with the front paws, licked and wiped. The back, flanks and rump are cleaned by turning the head and using the teeth directly.

That second movement requires a spine that bends, hips that rotate, a body slim enough to reach around, and a mouth that does not hurt. Take away any one of those and the back stops being groomed while the front stays immaculate.

This is why the distribution of flakes is more informative than the flakes themselves.

Flakes over the shoulders, spine and rump, front clean. The rabbit cannot reach. Check teeth, weight and mobility.

Flakes and crusts around the face, nose, ears and feet. More likely infectious, particularly ringworm, and more likely in a young, recently acquired or stressed rabbit.

Flakes plus a dirty bottom. Something is preventing the rabbit from cleaning itself and from eating its caecotrophs. This is an urgent combination in warm weather.

Flakes everywhere, generalised, with a rabbit that seems unwell. Systemic disease, and a full veterinary work-up rather than a skin treatment.

The causes, and how to tell them apart

Fur mites.

The classic sign is coarse, large flakes, often described as walking dandruff because the scurf appears to move when mites underneath it shift. They sit most heavily along the back and over the shoulders. Itching varies from none to severe. Many rabbits carry small numbers without any sign, which is why an outbreak so often coincides with something else going wrong: a dental problem, a period of illness, a new stressor, or simply the rabbit getting older and stiffer.

They are transmissible to people, and an owner with an itchy, spotty rash on the forearms or waist while the rabbit has scurf is a common and useful clue.

Ear mites.

A different mite, a different picture. Thick, layered, crumbly crusts build inside the ear canal and can spread onto the ear flap and the face. The rabbit shakes its head, scratches, holds the ear oddly, and is often in significant pain. This one is treatable and it is urgent, because untreated infestations perforate into the deeper ear.

The single most important instruction is not to remove the crusts. The tissue underneath is raw and inflamed, lifting them is intensely painful and causes bleeding, and it is unnecessary because the crusts detach on their own once the mites are killed.

Ringworm.

A fungal infection of the hair and skin, not a worm. It produces roughly circular areas of scale, crusting and hair loss, most often on the face, around the nose, on the ear margins and on the feet. It is more common in young rabbits, in recently acquired rabbits, and in animals under stress or with another illness.

It is transmissible to people and to other pets. Diagnosis needs a laboratory test rather than an appearance, because several rabbit skin conditions look similar and because the fungus most often involved does not fluoresce under an ultraviolet lamp.

Moulting.

Rabbits moult heavily and often unevenly, sometimes with a clear line moving across the body and tufts that lift out in handfuls. Scurf can accompany it. This is normal, but it has one important consequence: rabbits cannot vomit, so fur that is swallowed during heavy moulting has to pass through the gut. Combined with a low-fibre diet or reduced appetite it contributes to gut slowdown, which is the most common way rabbits die.

Fleas and lice.

Rabbits can carry fleas, usually acquired from a dog or cat in the household, and occasionally lice. Look for dark gritty flea dirt at the base of the coat that turns red on damp paper. Treatment must be prescribed for a rabbit, never borrowed from another species.

Environment and mismanagement.

Very dry indoor air, bedding dust, and inappropriate shampoos all irritate skin. Bathing is the worst of these: rabbits panic in water, their dense undercoat holds it so they chill badly, and struggling during a bath causes spinal fractures because rabbits have a light skeleton and powerful hind legs.

Underlying disease.

Dental disease is the single commonest reason a rabbit stops grooming its back, because the movement hurts and because a rabbit with painful molars stops using its mouth for anything optional. Obesity prevents the rabbit from turning. Arthritis and spinal changes reduce flexibility. Encephalitozoon cuniculi and other neurological problems cause weakness and incoordination. Pain from any source reduces grooming everywhere.

Check the ear entrance every week. Crusts here are painful long before the rabbit shows you it is uncomfortable.

The examination to do at home

Do this in good light, on a non-slip surface at floor level or on a table with a towel, with the rabbit supported and never on its back.

Part the coat over the shoulders, along the spine and over the rump, and look at the skin rather than the fur. Note whether flakes are loose, greasy or crusted, and whether the skin underneath is normal, red or thickened.

Look inside both ears without touching anything inside them. Look behind the ears, where crusting often starts.

Look at the face, the nose, the eyelid margins and the front feet, which is where rabbits wipe their faces and where ringworm often shows.

Look under the chin and at the dewlap, which stays damp in rabbits that drink from bowls and in females with a large fold.

Turn attention to the bottom. Part the fur around the tail and between the back legs and check that it is dry and clean. In warm weather do this daily, because a soiled bottom attracts flies and flystrike kills quickly.

Run your hands down the body and feel for the spine and hips. A rabbit you cannot feel the ribs on is overweight, and overweight rabbits cannot groom.

Watch the rabbit eat hay. A rabbit that eats pellets but abandons hay, drops food, or chews on one side has a dental problem.

A soft brush and a fine comb are all that is needed. Skip the shampoos and the medicated washes entirely.

What actually helps at home

Groom little and often rather than rarely and thoroughly. A soft brush and a fine comb, working with the lie of the coat, removes loose fur that would otherwise be swallowed.

Increase grooming frequency sharply during a moult, and check droppings at the same time. Smaller, fewer or fur-linked droppings during a heavy moult are an early warning of gut slowdown.

Keep hay unlimited and make it the largest part of the diet. Fibre keeps the gut moving and keeps the teeth wearing, which addresses two of the biggest contributors to poor coat condition at once.

Weigh weekly on a kitchen scale and record it. Weight gain is what removes a rabbit's ability to groom, and it is gradual enough to be invisible without a number.

Keep housing dry and well ventilated, spot clean daily, and avoid dusty bedding.

Treat every rabbit in the household when one is diagnosed with mites, because the others are almost certainly carrying them.

Wash your hands after handling a rabbit with undiagnosed skin disease, and use gloves if ringworm is suspected.

What never to do

Do not bathe a rabbit. If a bottom needs cleaning, clip the soiled fur carefully or ask a vet or groomer to do it, and use a damp cloth on a small area only.

Do not use flea or mite products intended for dogs or cats. Fipronil in particular has killed rabbits, and several other products are unsafe.

Do not pick, peel or soften ear crusts to remove them. They come away when the mites are dead.

Do not use human anti-dandruff shampoos, tea tree preparations, or essential oils. Several are toxic to rabbits and all of them interfere with diagnosis.

Do not clip a rabbit's coat with scissors close to the skin. Rabbit skin is thin, mobile and tears easily, and scissor injuries in rabbits are common and deep. Use clippers, or have it done professionally.

Do not treat the skin and stop there. If the flakes are on the back, find out why the rabbit stopped grooming.

Do not ignore a rabbit that has gone quiet, hunched, or off its food during any of this. Gut stasis is the emergency; skin disease is not.

When to get help

Contact a rabbit-experienced vet the same day for a soiled bottom in warm weather, any sign of maggots, a rabbit that is hunched, quiet and off its food, or one producing fewer or smaller droppings.

Book within the week for flakes over the back, ear crusting, head shaking, circular areas of hair loss, greasy or thickened skin, or any rash on a person in the household.

Book a routine appointment for a rabbit that is gaining weight, that has stopped eating hay, that is slower to move than it was, or that has simply stopped grooming its back for no obvious reason.

Bring the weight record, a tape strip from the affected area, photographs of the distribution of the flakes taken in good light, a full description of the diet including how much hay is actually eaten, the bedding and litter used, details of any other pets in the home and their parasite treatments, and a note of whether anyone in the household has developed a rash.

The goal is a rabbit that grooms its own back again, which usually means the teeth, the weight or the joints were sorted out.