Reptile husbandry
Bearded Dragon Husbandry: Getting the Non-Negotiables Right
Heat gradients, UVB output, enclosure size and diet by age — the four things that cause most bearded dragon illness when they are wrong.
AI-generated editorial illustration of the subject; not a photograph of a specific animal, product or case.
Bearded dragon husbandry checks
| Situation or check | Practical next step |
|---|---|
| Temperatures | Measure basking and cool ends with digital or infrared thermometers |
| UVB | Unfiltered by glass; replace on schedule |
| Weight | Weigh weekly and record |
| Diet | Insect-heavy for juveniles; mostly greens for adults |
| Weakness, tremors, swelling | Book an exotics vet |
Targets vary with age and health; confirm with an exotics veterinarian.
Most illness is husbandry, not bad luck
Exotic veterinary practices report that the majority of reptile cases they see are consequences of the environment rather than infectious disease. For bearded dragons, that means metabolic bone disease from inadequate ultraviolet light or calcium, impaction and gut problems, respiratory infection from cold or damp conditions, and obesity or liver disease from an overly rich adult diet.
The reassuring implication is that most of it is preventable with equipment set up correctly at the start.
Space and the thermal gradient
An adult needs a minimum footprint of around 120 x 60 cm, with more always better, and the enclosure must offer a genuine temperature gradient so the animal can choose. Reptiles do not regulate temperature internally; they move between zones.
- Basking surface: approximately 38-42 °C for adults, slightly warmer for juveniles
- Cool end: approximately 22-26 °C during the day
- Night-time: a drop to around 18-21 °C is normal and beneficial
- Measure with a digital probe or infrared thermometer at the basking surface, never with a stick-on dial
- Control heat with a thermostat — an unregulated bulb is a burn risk
UVB is equipment, not decoration
Bearded dragons come from high-UV environments and cannot metabolise dietary calcium without ultraviolet B exposure. Use a linear T5 fluorescent tube spanning roughly two-thirds of the enclosure length rather than a compact coil, position it at the manufacturer's stated distance, and account for mesh, which blocks a substantial share of the output.
UVB output falls long before the tube stops emitting visible light. Replace it on the manufacturer's schedule, typically every nine to twelve months, and write the date on the tube.
Diet changes dramatically with age
Juveniles are largely insectivorous and need daily live food with vegetables always available. Adults reverse this: roughly 70-80% leafy greens and vegetables, with insects a few times a week. Continuing a juvenile feeding pattern into adulthood is a leading cause of obesity and fatty liver disease.
Dust insects with a calcium supplement according to your vet's or a reptile-experienced keeper's schedule, and gut-load feeder insects before offering them. Avoid wild-caught insects, which may carry pesticides or parasites.
Signs that need an exotics vet
Tremors, a soft or swollen jaw, difficulty lifting the body off the ground, open-mouth breathing with mucus, prolonged refusal of food outside of a recognised brumation period, or straining without passing faeces all warrant prompt assessment by a veterinarian experienced with reptiles — not a general small animal practice by default.
Setting up and checking temperatures
Use at least two digital thermometers or an infrared thermometer to confirm the basking spot and the cool end, and connect every heat source to an appropriate thermostat. Stick-on dial thermometers are often inaccurate.
Commonly cited targets for adults are a basking surface of roughly 38 to 42 °C, a warm side in the low 30s and a cool end in the mid-20s, with a night-time drop. Ask your exotics vet to confirm targets for your dragon's age and health.
- Basking spot measured at the surface where the dragon actually lies
- A clear cool retreat so the dragon can regulate its own temperature
- Heat and UVB on a 12–14 hour daily cycle, with darkness at night
- UVB lamp replaced on the manufacturer's schedule even if it still lights
- Thermostat and lamp guards checked for faults and burn risks
A weekly health routine
Weigh your dragon weekly on kitchen scales and keep a simple log of weight, appetite, droppings and shedding. Gradual weight loss is often the first visible sign of a problem in a species that hides illness.
Wash hands before and after handling. Reptiles commonly carry Salmonella without looking unwell, so young children, older people and anyone with a weakened immune system need particular care.
Common husbandry mistakes
- Feeding only insects to adults, or too few insects to juveniles
- Skipping calcium supplementation or using UVB through glass, which blocks it
- Housing two dragons together, which often leads to stress and injury
- Loose particulate substrates for juveniles or dragons with a history of impaction
Frequently asked questions
- Can I use sand as a substrate?
- It is debated. Many vets advise solid substrates such as tiles or paper, especially for juveniles, because of impaction risk when husbandry is not ideal.
- Does my dragon need a companion?
- No. Bearded dragons are generally solitary, and housing them together commonly causes competition, stress and injury.
- How often should a bearded dragon see a vet?
- A check soon after purchase and then yearly with an exotics vet is a sensible routine, plus prompt visits for weight loss, lethargy or swelling.
- What are signs of metabolic bone disease?
- Soft or swollen jaws and limbs, trembling, weakness and difficulty climbing. These need an exotics vet; review UVB and calcium at the same time.
References
- Bearded dragon care — RSPCA
- Management and husbandry of reptiles — Merck Veterinary Manual
- Pet care and welfare advice — RSPCA
- Merck Veterinary Manual — Merck & Co.