Bearded Dragon Won't Eat and Keeps Hiding: How Worried Should You Be?

It's unnerving. The salad goes untouched, the locusts get ignored, and your bearded dragon spends the day flattened behind a piece of cork bark with its eyes shut. Yesterday it was pacing the glass like it owned the place.

The good news: in bearded dragons, appetite loss and hiding are usually a symptom of the enclosure rather than the animal. The less good news: they can also be the first visible sign of something serious, because reptiles are quietly brilliant at concealing illness. So you work through it in order — environment first, season second, health third — and you keep a close eye on the one number that tells the truth.

Start with heat, because almost everything starts with heat

A bearded dragon doesn't make its own body warmth. Digestion, immune function and hunger itself all depend on reaching the right temperature each day. Let the basking spot drift a few degrees too cool and the whole system slows down: food sits in the gut, the dragon feels rotten, and it stops asking for more.

A cold dragon isn't being fussy. It physically can't process the meal you're offering.

Measure the basking surface — the actual rock or branch the dragon lies on — with a digital probe or an infrared temperature gun. Stick-on dial thermometers are close to useless. As a general guide, adults want a basking surface around 35–40°C, juveniles a little warmer, with a cool end in the low-to-mid 20s so they can choose. Night-time can safely drop into the high teens or low twenties for most set-ups.

Then check the UVB. Fluorescent tubes keep glowing long after their useful output has faded, which is why the rule of thumb is to replace them roughly every 6–12 months depending on the model. Note the date on the tube with a marker. Also check nothing is blocking it: ordinary glass and most plastic mesh filter UVB out almost completely, and a tube mounted too far from the basking spot delivers very little.

Is it brumation?

Bearded dragons come from a part of Australia with real seasons, and many captive dragons still follow them. Brumation is a reptile's version of a long winter lie-in: digging, burrowing into a corner, sleeping for days, refusing food for weeks or even a couple of months. It typically shows up in autumn and winter, usually in dragons over about ten to twelve months old, and it can arrive even in a stable, well-lit vivarium.

A brumating dragon looks sleepy but otherwise well. Clear eyes. Good body condition. Alert if you lift it out, even if it would rather you didn't. It may still drink and take the occasional bite.

The deciding factor is weight. Buy a small digital kitchen scale, weigh your dragon on the same day each week and write it down. Gentle, gradual loss across a brumation is normal. A steady downward slide, or a drop of more than roughly ten per cent of body weight, is not — that's a vet conversation, whatever the calendar says.

The ordinary, non-worrying explanations

Plenty of dragons go off food for reasons that resolve on their own:

• Shedding. Dull, greyish patches and a general grumpiness; appetite usually returns once the skin comes away.
• Settling in. A newly homed dragon may hide and fast for a week or more. Keep handling minimal, keep the room quiet, offer food daily and let it come round.
• Growing up. Juveniles eat insects with terrifying enthusiasm; adults naturally shift towards greens and eat considerably less overall.
• Stress. A cat that sits on top of the viv, a vivarium in a busy hallway, reflections in the glass, or another dragon in sight — any of these can keep an animal hidden and off its food.
• Boring menu. Some dragons simply stop fancying the same brown crickets they've had for a year.

When it's illness

Here's where the hiding stops being quirky. Treat these as reasons to get an appointment rather than wait another week:

• Weight loss, sunken eyes, loose skin over the hips, or a visible spine and ribs.
• Open-mouthed breathing, wheezing, clicking, bubbles or mucus around the nose or mouth.
• No droppings for an unusually long stretch, or very runny, bloody or foul-smelling ones.
• Trembling, jerky limbs, a soft or swollen jaw, or difficulty lifting the body off the floor — possible metabolic bone disease, which is common where UVB has been inadequate.
• A dragon that is limp, unresponsive, or cannot right itself when gently turned over.
• In females, restlessness, digging and swelling through the abdomen with no eggs produced — a possible egg-binding emergency, including in females kept alone.

Internal parasites, impaction from loose substrate, mouth infection and early organ disease all show up first as the same vague picture: quiet, hidden, not eating. That's exactly why vague symptoms in reptiles deserve more attention, not less.

What to do this week

1. Measure basking surface temperature, cool-end temperature and night temperature with a digital device. Correct anything off.
2. Check the UVB tube's age, its distance from the basking spot, and whether anything is blocking it.
3. Weigh your dragon and start a simple log — date, weight, droppings, what was eaten.
4. Reduce stress: cover one or two sides of the viv, move it out of the thoroughfare, pause handling for a few days.
5. Offer food in the warm part of the day, after a good hour of basking. Try something new and tempting — a wax worm or two, finely chopped butternut squash, a dandelion leaf, a live insect that moves rather than one sitting still in a bowl.
6. Keep hydration going. A shallow warm bath for ten minutes, or water trickled gently onto the snout, helps some dragons drink.

If the set-up checks out, your dragon holds its weight, and there are no red flags, a quiet fortnight is often just a quiet fortnight. If the weight starts falling, or anything on the illness list appears, stop troubleshooting at home and make the call.

Take your temperature readings and weight log with you. For a reptile vet, that notebook is worth more than any description of how the dragon has been "acting a bit odd".