Hedgehog green droppings and diarrhoea: what they mean

Quick answer

Green droppings are the single most common thing hedgehog owners ask about, and the colour itself is not a diagnosis. Green means bile that has moved through the gut faster than the gut could process it, which tells you transit has sped up and nothing about why.

Hedgehog on a soft rug

The two questions that matter far more than the colour are whether the hedgehog is still eating, and what the enclosure temperature is. A hedgehog that is eating normally and passing one odd dropping is in a different situation from one that is cold, curled up and refusing food, and the second of those is an emergency in a small insectivore with a fast metabolism.

• Green usually means fast transit or an empty gut, not poisoning and not a specific disease.
• Check the enclosure temperature before you change anything else. A cold hedgehog stops digesting.
• Weigh daily. Weight loss is the number that decides urgency, not the appearance of the stool.
• Fresh red blood, black tarry stool, or diarrhoea with refusal to eat all need a vet the same day.
• Hedgehogs are a recognised source of Salmonella, so handwashing after any contact is not optional.

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A hedgehog that is cold, curled tightly and will not uncurl is not sulking. It is attempting hibernation.

African pygmy hedgehogs, the species kept as pets, are not adapted to hibernate properly. When the enclosure drops below their comfortable range they enter a torpid state they cannot safely sustain, digestion stops, the immune system shuts down, and they deteriorate over hours. Green or absent droppings are often the first thing an owner notices. Warm the hedgehog gradually against your body or with a warmed enclosure, do not use direct heat on the animal, and call an exotics vet immediately.
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Decide in 60 seconds

Why droppings turn green

Bile is made in the liver, stored in the gallbladder and released into the small intestine to help digest fat. When it enters the gut it is green. As it travels, bacteria and chemical changes convert the pigment progressively, and by the time normal stool leaves the body it is brown.

Anything that shortens the journey leaves the pigment unconverted, and the stool comes out green. That is why green stool is a sign of speed rather than of a particular disease.

There is a second route to the same colour. If a hedgehog is not eating, bile is still produced and still released, but there is no food for it to mix with or slow it down. It passes through largely unchanged, and the small amount of stool produced is green, often slimy, and sometimes described as mucus.

Both of those are worth knowing because they point in different directions. Green stool from an eating hedgehog suggests the gut is irritated and hurrying. Green stool from a hedgehog that has stopped eating suggests the problem is upstream of the gut entirely, and it is the appetite that needs explaining.

What normal looks like

A healthy African pygmy hedgehog on a good diet passes firm, formed, sausage-shaped droppings, brown to very dark brown, with a slightly moist surface and a smell that is noticeable but not offensive.

The stool often contains visible fragments of insect exoskeleton, which is chitin. Owners regularly mistake these for worms or for undigested food that indicates a problem. They are neither. Chitin is not fully digestible in any insectivore and passing it is normal.

Volume tracks intake. A hedgehog that has run the wheel all night usually produces a lot, and much of it will be smeared across the wheel, which is entirely normal behaviour and one of the reasons the wheel needs cleaning daily.

Colour shifts slightly with diet. A food change, a different insect, or a coloured treat can alter the shade for a day or two without meaning anything, and this is the one situation where the honest answer is to watch and recheck.

The causes, and how to tell them apart

Temperature.

Always first. A hedgehog kept below its comfortable range slows down, eats less, and digests poorly, and the droppings change before the owner notices the hedgehog is cold. Thermostatically controlled heating, a thermometer at floor level in the enclosure rather than on a wall, and a check of the room at its coldest point overnight will resolve a surprising proportion of these cases.

Diet change.

The most common benign cause. A new food, a new batch of the same food, a switch of insect, or a sudden increase in fatty treats. Mealworms in particular are high in fat and low in useful minerals, and a hedgehog whose owner has been generous with them frequently produces loose green stool.

The tell is timing. If it started within a day or two of a change and the hedgehog is otherwise itself, that is likely the cause. Change food over seven to ten days rather than overnight.

Milk and dairy.

Adult hedgehogs cannot digest lactose. Cow's milk, cream and most milk-based treats produce reliable diarrhoea and should never be given.

Hedgehog exploring a pet care setup

Stress.

A new home, a house move, transport, a change of room, or a new pet in the household. Stress diarrhoea in this species is real and usually resolves within a few days once the environment settles. It is a diagnosis to reach after the others, not before.

Coccidia and other parasites.

Coccidia, Cryptosporidium, Giardia and various worms all cause loose, green or mucoid stool, sometimes with a rank smell, and often with weight loss out of proportion to how the hedgehog looks. Crucially, parasites are shed intermittently, so a single negative faecal test does not clear the hedgehog. Vets often ask for samples collected over three consecutive days for this reason.

Bacterial infection.

Salmonella is the one to know about, both because it causes genuine illness in hedgehogs and because it passes to people. Others include various coliforms and clostridia. Bacterial enteritis tends to produce a sicker hedgehog: dull, off food, sometimes vomiting, with watery stool.

Antibiotic-associated upset.

A hedgehog partway through a course of antibiotics for something else can develop loose stool as the gut flora shifts. Do not stop the course on your own judgement, but do tell the prescribing vet.

Foreign material.

Hedgehogs ingest bedding, fabric fibres from fleece liners, and pieces of toys. Partial obstruction causes intermittent diarrhoea and reduced appetite, and it is easy to miss because the hedgehog still passes something.

Liver disease.

Hepatic lipidosis develops in a hedgehog that stops eating, and it develops quickly. This is why anorexia is treated urgently rather than watched: an animal this small with this metabolic rate mobilises fat into a liver that cannot process it fast enough.

Tumours.

Neoplasia is common in this species, particularly from middle age onward. Gastrointestinal tumours and lymphoma cause weight loss, changed droppings and a gradually declining appetite. Any older hedgehog with persistent gut signs deserves a proper work-up rather than a third diet change.

Blood, and what its appearance tells you

Fresh red blood, on the surface of the stool or in the tray.

Bleeding from the lower gut, the rectum or the anus. Causes include colitis, straining, a prolapse, a foreign body or trauma. Look also at whether the hedgehog is straining, and check the vent area for anything protruding, which is an immediate emergency.

Black, tarry, sticky stool.

This is digested blood, and it means bleeding higher up in the stomach or small intestine. Ulceration, a tumour, or a clotting problem are all possibilities. It is a same-day veterinary problem and it is easy to dismiss as simply dark stool.

Blood mixed with mucus.

Suggests inflammation of the large bowel. Common with parasites and with bacterial enteritis.

Anything red in the tray that is not clearly stool needs a second look. Urine can be pink or red from urinary tract disease or bladder stones, and that is a different problem with a different urgency.

Checking the hedgehog rather than the stool

Weight, daily.

A kitchen scale reading in grams, taken at the same time each day, is the most useful number you can produce. A downward trend over three days is meaningful even in a hedgehog that looks well.

Appetite, measured rather than guessed.

Count the pieces of kibble or weigh the portion, and record what is left in the morning. Owners consistently overestimate how much a sick hedgehog has eaten.

Hydration.

The usual skin tent test is impractical through spines. Instead look at the gums, which should be moist and slippery rather than tacky, at the eyes, which should be full and bright rather than sunken and dull, and at how much urine is in the substrate. Reduced urine plus tacky gums is significant dehydration.

Activity.

The wheel is a diary. A hedgehog that normally leaves a heavily soiled wheel and now leaves a clean one has not been running, and that is often the earliest sign of all.

Temperature of the animal.

A hedgehog that feels cool to the touch on the belly, is slow to uncurl, and is wobbly when it walks is hypothermic. This is urgent regardless of what the stool looks like.

Hedgehog exploring its surroundings

Collecting a sample the vet can actually use

Take the freshest dropping you can find, ideally straight from the wheel or from a clean liner rather than out of soiled substrate.

Put it in a clean, sealed plastic pot. A screw-top sample pot from the practice is ideal, but any clean sealed container works. Do not wrap it in tissue, which absorbs the moisture the laboratory needs.

Keep it cool, not frozen, and get it to the practice the same day where possible.

Ask whether they want a three-day pooled sample. For parasites, collecting a small amount on each of three consecutive days into the same pot substantially improves the chance of finding something that is shed intermittently.

Photograph the droppings in the enclosure before you collect them, on a light background, with something ordinary next to them for scale. Colour and consistency change on the way to the surgery, and a photograph of what it actually looked like is more useful than a description.

Hygiene, because this one passes to people

Hedgehogs are a documented source of Salmonella infection in people, and a hedgehog can shed it while appearing entirely healthy.

Wash hands with soap and water after handling the hedgehog, its bedding, its wheel, its food bowls or anything from the enclosure. Hand sanitiser is not a substitute.

Do not clean the wheel or bowls in the kitchen sink or in a bath a person uses without disinfecting afterwards. Keep a dedicated basin.

Do not let the hedgehog roam on kitchen worktops or dining tables, and do not eat while handling it.

Children under five, older adults, pregnant people and anyone immunosuppressed are at higher risk and should not handle a hedgehog with diarrhoea at all.

What never to do

Do not give human antidiarrhoeal medicines. Nothing from a human cabinet is dosed or licensed for this species, and slowing the gut is exactly wrong when the cause is an infection the body is trying to clear.

Do not give leftover antibiotics from a previous illness or from another animal.

Do not offer cow's milk, cream, or milk-based treats to settle the stomach.

Do not change the diet again while you are still working out what happened. Repeated changes destroy the timeline and make the cause impossible to identify.

Do not treat a persistent problem with probiotics alone. They may help, and they do not replace finding out what is wrong.

Do not feed insects caught in the garden. They are a route for both parasites and pesticide residues.

Do not warm a hypothermic hedgehog on a hot water bottle, a heat pad set high, or a radiator. Gradual warming, ideally against your own body inside a fleece, and a call to the vet.

Do not assume a hedgehog that stops having diarrhoea has recovered. Absence of droppings can mean the gut has stopped rather than settled.

Hedgehog exploring its surroundings

When to get help

Go the same day for watery diarrhoea, any blood in the droppings, black tarry stool, refusal to eat, a hedgehog that feels cold and will not uncurl, no droppings at all for a day, or anything protruding from the vent.

Book an appointment within a few days for droppings that have been loose or green for more than twenty-four hours in a hedgehog that is otherwise eating, for visible worms, for a smell that has changed markedly, or for any gradual weight loss.

Ask for a full work-up rather than another diet trial if a hedgehog over about two years old has persistent gut signs, because tumours and liver disease are common in this species and are missed when the assumption is dietary.

Bring the daily weights, the enclosure temperature record, a full list of what is fed including brands and treats, a fresh faecal sample, and photographs of the droppings and the wheel. Say clearly when the hedgehog last ate, and how much.