Hedgehog climbing and falls: why they scale the bars and the injuries that follow

Quick answer

A hedgehog working at the walls of its enclosure is telling you something about the enclosure. Scratching, digging at corners and climbing are all versions of the same message.

Pet hedgehogs climb far better than most owners expect. They have strong forelimbs and curved claws, and a wire barred cage is a ladder to them. What they cannot do is climb down, judge a drop, or land safely, and a startled hedgehog balls up in mid air and arrives as an unbraked weight.

That combination makes scratching and climbing at the enclosure walls both a welfare signal and an injury risk. The behaviour points at something wrong with the space, the temperature, the routine or the animal, and the fall that follows breaks legs.

• Solid sided enclosures, not wire bars. This one change removes most climbing injuries.
• Prioritise floor area over height. Hedgehogs are ground animals and a tall cage is wasted space with a fall risk.
• Persistent climbing usually means the enclosure is too small, too cold, too bright, too boring, or the hedgehog is hungry.
• Handle sitting on the floor. Dropped from standing height is the other common way hedgehogs break limbs.
• A hedgehog that will not unroll, will not bear weight, or is quiet the day after a fall needs a vet.

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A hedgehog that falls from height, or gets a leg caught in cage bars or a wheel, can suffer a fracture, a dislocation or a degloving injury that is invisible under the spines.

Hedgehogs ball up when they are frightened or in pain, which hides the limbs completely, and they do not vocalise consistently when injured. A hedgehog that has fallen and then curled tightly and refused to open is not sulking. Do not force it open, do not attempt a splint, keep it warm and quiet in a small container and get it to an exotics vet the same day. Cold and stress push an injured hedgehog into torpor, which makes everything worse.
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Decide in 60 seconds

Why hedgehogs climb, and why it goes wrong

A hedgehog's forelimbs are powerful and its claws are curved and sharp, because in the wild it digs and it pushes through undergrowth. Applied to a horizontal wire bar, those same claws hook perfectly. The animal pulls itself up hand over hand.

Going up is deliberate. Coming down is not. Hedgehogs have no tail to counterbalance, no prehensile grip to control a descent, and no reflex to right themselves in the air. Most simply lose grip and drop, and many curl on the way down, which converts them into a ball that lands on whichever part happens to be underneath.

The body plan makes that worse. The spines are on the dorsum and flanks, and they are excellent protection against a predator's mouth. They do nothing to absorb an impact through a limb. The legs themselves are relatively fine boned for the mass they carry, which is why fractures are the typical outcome rather than bruises.

There is a second injury mechanism that has nothing to do with the fall. A limb pushed through a wire gap and then loaded by the animal's own weight can fracture or deglove, and a toe caught in a gap on a wheel, or wound with a thread from a fleece liner, can be stripped or lost. These injuries are silent because the wound is under the spines and the hedgehog will not show you.

What the climbing is actually telling you

Enrichment at ground level competes with the walls. Hides, tunnels, a dig box and food that has to be found give a hedgehog somewhere to put its night that is not the cage bars.

Too little floor space. The most common cause. Hedgehogs cover a lot of ground at night and a small footprint produces persistent boundary behaviour. Add floor area, not height.

No wheel, or the wrong wheel. A wheel that is too small forces the spine into a curve and the hedgehog will avoid it, so the energy goes into the walls instead. A wheel with a mesh or barred running surface catches feet and will be rejected once it hurts. A large diameter, solid surfaced wheel is the single most effective piece of enrichment for this species.

Temperature below the comfortable range. Cool hedgehogs become restless before they become sluggish, and a hedgehog attempting to hibernate often paces, seeks and climbs first. Any climbing that appears as the weather turns colder should send you to the thermometer before anything else.

Heat placed above the enclosure. A heat source mounted overhead gives the animal a reason to climb toward it. Ambient heating that warms the whole enclosure, controlled by a thermostat, removes the incentive.

Light cycle problems. Too much light, or an irregular cycle, disrupts activity patterns and produces restless, unsettled nights.

Hunger. A portion that is too small, or a food the hedgehog dislikes, produces foraging behaviour that becomes wall directed when there is nothing to find.

Boredom. An empty box with a hide and a bowl gives a nocturnal forager nothing to do for eight hours. Scatter feeding, dig boxes, tunnels and rotating novel objects all reduce boundary behaviour.

Nest seeking and hormonal drive. Females carrying bedding and shredding may be nesting. Males in breeding condition roam. Both increase escape attempts.

Something aversive nearby. A television, a washing machine, a cat sitting outside the enclosure, a draught, a strong smell. Hedgehogs try to leave places that feel wrong.

Pain or illness. Less common as a cause of climbing specifically, but any sudden change in night time behaviour deserves a health check rather than only a husbandry review.

The differentials for a restless hedgehog

Mites and skin disease. Present as scratching at the body, quill loss, flaky skin and crusting rather than as climbing. Itchy animals rub and scratch; escaping animals climb and dig at corners. The two look similar at a glance on a camera.

Hibernation attempt. Restlessness, then wobbliness, then a cold belly and a tightly curled animal that is difficult to rouse. This is a genuine emergency in a pet hedgehog and it is temperature driven.

Overheating. Splatting flat, panting, seeking the coolest corner, and lying stretched out rather than balled. Different picture, opposite fix.

Wobbly hedgehog syndrome. Progressive weakness and incoordination, usually starting at the back end, with the animal falling over rather than climbing. Not a behaviour problem.

Pregnancy. Bedding carrying, nest building, increased appetite and weight, in a female that has had contact with a male.

Normal nightly activity. Hedgehogs are active for much of the night and cover ground. A hedgehog that wheels for hours, forages, then sleeps is not restless, it is nocturnal.

Building an enclosure that removes the risk

Solid walls. A large solid sided container or a purpose built enclosure. No horizontal bars. This single change eliminates the climb and the caught limb at the same time.

Floor area over height. More usable ground beats a second level every time. Multi level cages are designed for climbing species and are the wrong shape for a hedgehog.

A secure lid if there is any chance of climbing on furniture inside, but the lid is a backstop, not the plan.

Ramps done properly. If you use a level change, keep the gradient shallow, give it solid sides, and cover the surface with something that grips. An open ramp above the floor is a fall waiting to happen.

A large diameter solid surface wheel, cleaned regularly, with no gaps that can catch a foot.

Bedding without threads. Fleece liners must be hemmed or the edges sealed, because loose threads wrap around toes and cut off circulation. Check feet and toes at every handling session.

Ambient heat, thermostatically controlled, sitting within the comfortable range for the species, so the animal never has a reason to climb toward a warm spot or to attempt hibernation. Use a thermometer inside the enclosure at hedgehog level rather than trusting the room.

Enrichment on the floor. Tunnels, hides, a dig box, scattered food, cardboard to shred, and novel safe objects rotated regularly.

Handling without dropping

A hedgehog that is comfortable will uncurl and explore. One that stays balled is telling you it is not ready, and a hedgehog that is not ready is a hedgehog that will suddenly move.

Falls from hands cause as many injuries as falls inside enclosures.

Sit on the floor. Every handling session, especially with a new or nervous hedgehog. If it comes off your hands it falls a short distance onto a soft surface rather than a long distance onto a hard one.

Scoop from underneath with both hands, do not grip. A gripped hedgehog braces and then springs.

Expect the sudden move. Hedgehogs go from still to fast without a warning phase. Assume it will happen.

Never carry a hedgehog while walking around the house. Use a container.

Do not hand a hedgehog to a child at standing height. Sit everyone on the floor first.

Never lift by the spines or scruff.

After a fall

Do not force the ball open. You will not achieve anything, and forcing risks worsening a fracture.

Contain it small and warm. A ventilated box with a towel that has no loose threads, in a warm quiet dark place. Injured hedgehogs lose body heat quickly and a cold hedgehog becomes a torpid one.

Do not splint, bandage or manipulate a limb.

Do not offer painkillers. Human analgesics are toxic to hedgehogs and dose is not something to guess at.

Do not force feed or force water.

Watch for the delayed picture. Some falls look fine for hours. Reduced appetite, no wheel use overnight, a limb held up, a change in gait, a wound that appears under the spines, swelling of a foot, or an animal that stays balled all point to an injury that needs assessment.

Photograph and note the height, the surface and the time. It matters clinically.

The routine that catches problems early

What never to do

Never house a hedgehog in a wire barred cage, regardless of the base.

Never use a wheel with a mesh or barred running surface, and never one small enough to curve the spine.

Never leave unhemmed fleece or towelling with loose threads in the enclosure.

Never handle a hedgehog above lap height while standing.

Never mount the only heat source above the enclosure.

Never assume a hedgehog that ran off after a fall is uninjured. Spines hide everything.

Never force a balled hedgehog open, and never try to unroll one by putting it in water.

Never give a human painkiller.

When to get help

Go the same day for a hedgehog that will not unroll after a fall, that is not bearing weight on a limb, that has a swollen or angled leg, that has a wound anywhere, or that has had a limb caught in bars, a wheel or fabric.

Go the same day for a cold, sluggish, tightly curled hedgehog, because a hibernation attempt is an emergency in a pet hedgehog.

Book an appointment within a few days for persistent scratching with quill loss, for a change in gait, for weight loss, or for a hedgehog that has stopped using its wheel.

Bring your weight log, your temperature readings, a note of the height and surface of any fall, and video of the behaviour if you have it.

The goal is a hedgehog that spends its night on the floor of a space worth exploring, and sleeps securely by day. Climbing stops when the ground is more interesting than the walls.