Hedgehogs: seizures and collapse, first response and the look-alikes

Quick answer

Most of what owners report as a hedgehog seizure is not one. The single most common explanation is a cold hedgehog attempting to hibernate, which African pygmy hedgehogs are not built to survive, and the second most common is self-anointing, a normal behaviour that looks alarming the first time you see it.

That matters because the responses are different. A torpid hedgehog needs gradual warming and a vet. A genuinely seizing hedgehog needs the enclosure made safe, the episode timed and filmed, and no hands near it. Getting the first assessment right is most of the job.

Before anything else, feel the animal and check the enclosure temperature. Cold is the answer far more often than epilepsy is.

• Check the enclosure temperature first. A cold hedgehog attempting hibernation looks neurological and is a housing emergency.
• Self-anointing involves contortion, frothy saliva and deliberate spreading onto the quills. The animal is fully conscious.
• Never put your hands or anything else near the mouth of an animal that is genuinely seizing.
• Time the episode and film it. Duration and appearance are what the vet needs.
• Any first seizure, any seizure over a few minutes, and any cluster of seizures is an emergency.

:::danger
An African pygmy hedgehog is a tropical species and does not hibernate safely.

In a cool enclosure it becomes cold to the touch, sluggish, unable to uncurl properly and may tremble or seem unresponsive. This is not sleep and it is not a seizure. Warm the animal gradually against your body or in a warm room over an hour or more, do not apply direct heat, and contact a vet. Repeated attempted hibernation causes fatal metabolic and respiratory complications.
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Decide in 60 seconds

What a real seizure looks like

A genuine seizure involves loss of awareness. The hedgehog does not respond to its name, to touch, or to the environment. That is the feature that separates it from almost everything on the look-alike list.

Typical features include sudden onset with no trigger, stiffening or rhythmic paddling of the limbs, twitching of the face or body, an inability to hold a normal posture, sometimes vocalisation, sometimes salivation, and sometimes passing urine or droppings.

Afterwards there is usually a recovery period in which the animal is disoriented, unsteady, may seem blind or deaf, may be unusually hungry or unusually withdrawn, and gradually returns to normal over minutes to hours.

Duration matters enormously. Most single seizures are short. An episode that continues beyond a few minutes, or a series of episodes with no full recovery in between, is an emergency because prolonged seizure activity causes overheating, oxygen deprivation and brain injury.

What to do while it is happening

Do not pick the animal up. Handling during a seizure achieves nothing, risks a bite that the hedgehog has no control over, and can prolong the episode by adding stimulation.

Do not put anything in or near the mouth. There is no risk of a hedgehog swallowing its tongue, and fingers near a jaw that is contracting involuntarily is how owners get injured.

Make the space safe. Remove or block the wheel, because a hedgehog convulsing near or inside one can be badly injured. Move water dishes and anything hard or sharp. Do not lift the animal onto a table where it could fall.

Lower the stimulation. Turn the lights down and reduce noise. Sensory input can prolong a seizure.

Start timing. Note the exact start and end on your phone. This is the single most useful piece of information you can gather.

Film it. A short video shows the vet what type of activity is occurring, whether it is generalised or focal, and how the animal recovers. Owners rarely describe seizures accurately, and video removes the guesswork entirely.

Note the temperature. Read the enclosure thermometer while you wait, because you may be looking at a temperature problem rather than a neurological one.

Afterwards, keep it warm, quiet and dark. Let the animal recover in its own space. Do not offer food or water until it is clearly alert and coordinated, because a disoriented animal aspirates easily.

Then call a vet, even if it has recovered completely.

The look-alikes, and how to tell them apart

Two of these deserve extra emphasis because they are so often confused with seizures.

Self-anointing. A hedgehog that encounters a new smell or taste will sometimes chew at the source, produce a large volume of frothy saliva, and then contort itself dramatically to spread that foam over its own quills with its tongue. It looks like a fit. It is a normal, ancient behaviour whose function is debated, and the animal is entirely aware throughout: it will look at you, it will stop if genuinely disturbed, and it goes back to normal immediately afterwards. If your hedgehog is twisting but is clearly aware and clearly aiming saliva at its own spines, it is anointing.

Attempted hibernation. African pygmy hedgehogs come from a warm climate and lack the physiological machinery for a safe hibernation. In a cool enclosure the body begins to shut down anyway. The animal becomes cold, its heart rate and breathing slow, it curls tight and cannot uncurl, and it may tremble or seem unresponsive. Owners describe this as a collapse or a fit. The test is the temperature of the animal and of the enclosure. Warm it gradually against your body or in a warm room over an hour or more, never with direct heat, and get it seen. Every attempted hibernation is a warning that the housing temperature is wrong.

A thermometer reading, a weight and a written note of the time and duration turn a frightening five minutes into usable clinical information.

Wobbly hedgehog syndrome is not a seizure disorder

This is worth stating clearly because it is the condition owners have usually read about before anything else.

Wobbly hedgehog syndrome is a progressive degenerative disease of the nervous system. It typically begins as unsteadiness in the hind limbs, progresses forward over weeks and months, and eventually affects the animal's ability to move, eat and hold itself up. Throughout, the animal remains conscious and aware. It is most often reported in animals under two years of age, although it can appear later.

It is not a fit. There is no loss of awareness, there is no sudden onset and no recovery period, and it does not come and go.

It also cannot be confirmed in a living animal. A definitive diagnosis requires examination of nervous tissue after death, so any diagnosis in life is a presumption reached after excluding the treatable causes. That is precisely why the workup matters: a wobbly hedgehog might have an ear infection, a spinal injury, a nutritional problem, a tumour or a toxin exposure, and several of those can be treated.

An owner who accepts a wobbly hedgehog syndrome label without investigation may be giving up on a treatable animal.

What the vet will want

A short video of the episode, which is worth more than any description.

The exact duration and the time of day.

How many episodes, over what period, and whether the animal returned fully to normal in between.

The enclosure temperature, ideally from a thermometer inside the enclosure and ideally a maximum and minimum reading, not the room thermostat.

The weight, and the weight trend.

The diet, including the brand of kibble, any recent change, what insects are fed and where they come from.

When the animal last ate.

Any product used in the house recently: insecticide sprays, plug-in devices, cleaning chemicals, essential oil diffusers, and specifically any flea or parasite product, including ones applied to other pets in the household.

Any fall, escape, or possibility of being trodden on or dropped.

The animal's age, sex and whether it is intact, and any breeding history.

Expect a physical and neurological examination, blood tests including glucose, and possibly imaging. Expect the vet to check the ears, because middle and inner ear disease produces dramatic signs that are entirely treatable.

Reducing the risk

Temperature is the biggest single factor. Keep the enclosure within the range your vet advises for the species, monitor it with a thermometer that records the overnight minimum, and use a thermostatically controlled heat source rather than a heat mat with no control. Cold nights are what catch people out, particularly in autumn when the heating is not yet on.

Prevent falls. Secure the enclosure. Handle the animal sitting down and low, never standing over a hard floor. A hedgehog that gets out and falls from furniture is a common head-injury presentation.

Make the wheel safe. A solid running surface with no cross-bar, and a stable stand.

Be careful with chemicals. Do not use insecticide sprays, plug-in vaporisers or aerosol cleaners in the room. Do not apply flea or parasite products intended for cats or dogs. Ask your vet before applying anything to a hedgehog at all. Avoid essential oil diffusers.

Feed appropriately and consistently. An animal that has stopped eating is at risk of low blood sugar, and appetite loss is one of the earliest signs of illness in this species.

Weigh weekly. Weight change precedes almost everything.

Bright symmetrical eyes, even quill cover and a normal response to your voice are the baseline you compare an episode against.

What never to do

Do not restrain or hold a hedgehog during a seizure.

Do not put your fingers, a spoon, or anything else near the mouth.

Do not offer food or water until the animal is fully alert and coordinated.

Do not warm a cold hedgehog with direct heat, a hot water bottle against the skin, or a hairdryer. Gradual warming only.

Do not use any flea, tick or mite product intended for a cat or dog.

Do not assume an episode was self-anointing unless the animal was clearly aware and clearly applying saliva to its own quills.

Do not accept wobbly hedgehog syndrome as an explanation without a proper workup, because several treatable conditions look the same.

Do not wait until morning after a first seizure.

When to get help

Go immediately for a seizure lasting more than a few minutes, for repeated seizures without full recovery between them, for a hedgehog that is unconscious or unresponsive, for a suspected head injury, and for a suspected toxin exposure.

Go the same day for any first seizure even if it was brief and the animal recovered, for a hedgehog found cold and torpid after you have warmed it gradually, for tremor and weakness in an animal that has not eaten, and for a head tilt, circling or one-sided weakness.

Book promptly for progressive unsteadiness developing over weeks, and ask for a full workup rather than accepting a presumptive label.

Book a routine check for any hedgehog whose weight is falling, whose appetite has changed, or whose enclosure has been running cooler than it should.

The aim after any episode is an animal that eats, moves normally, holds its weight, and lives in an enclosure whose temperature you can prove.

Bring the video, the timings, the enclosure temperature readings including the overnight minimum, the weight record, the exact diet and the source of any insects, a list of every chemical, aerosol, plug-in and parasite product used anywhere in the home, the animal's age and sex, and any history of falls or escapes. Expect the vet to check the ears and to run blood glucose early, because those are two of the most commonly missed and most treatable explanations.