How to Care for a Bearded Dragon: Complete Guide

Bearded dragons are the most popular pet reptile, and the most commonly failed one — sold with setups that lack the UVB lighting they cannot live without, and diets that skip the vegetables that adult dragons need. The setup that works is specific, moderately expensive, and non-negotiable. This guide covers the enclosure, the lighting, and the diet that produce a healthy, long-lived dragon.

The two most common failures: insufficient UVB, which causes fatal metabolic bone disease, and an insect-only adult diet, which causes obesity and deficiency.

The Enclosure: 40 Gallons Minimum

• 40-gallon breeder tank is the adult minimum — bigger is better. The juvenile 20-gallon gets outgrown within months.
• Length matters more than height — bearded dragons are terrestrial, and floor space is the territory.
• Substrate: tile, newspaper, or reptile carpet for beginners. Loose sand is popular and risky — impaction from ingestion is a common emergency. If sand is used, it must be digestible-calcium sand fed with caution.
• Screen top for ventilation with UVB and heat lamps.
• Hides and climbing — a hide on the cool side, branches or rocks for climbing, and open basking space.

Lighting: The UVB That Is Not Optional

UVB is the single most important and most commonly omitted element:

• A UVB bulb is non-negotiable. Without it, bearded dragons cannot synthesize vitamin D3, cannot absorb calcium, and develop metabolic bone disease — deformities, soft jaws, tremors, and death.
• Bulb type: linear fluorescent (ReptiSun 10.0 or equivalent) or mercury vapor bulbs. Coil bulbs are inconsistent and often inadequate.
• Placement: 10 to 12 inches from the basking spot, no glass or plastic between the bulb and the dragon — glass blocks UVB.
• Replace every 6 to 12 months — UVB output degrades even when the bulb still lights up. A bright bulb with no UVB is a common trap.
• The basking spot: 95 to 105 degrees. A thermometer at the basking level measures it — not the air temperature elsewhere.
• Ambient: 75 to 85 on the cool side, dropping to 70 at night. A gradient lets the dragon thermoregulate.

The “it seems fine without UVB” phase lasts months — the damage accumulates invisibly, and by the time symptoms show, the disease is advanced and often irreversible.

Diet: The Juvenile-to-Adult Shift

The ratio changes with age, and getting it wrong causes problems at both stages:

Juveniles (Under 12-18 Months)

• 70 to 80 percent insects, 20 to 30 percent vegetables. Growing dragons need protein.
• Insects: crickets, dubia roaches, black soldier fly larvae, silkworms. Variety beats any single feeder.
• Gut-load insects 24 hours before feeding — the insects carry the nutrition.
• Dust insects with calcium with D3 at most feedings, plus a multivitamin twice a week.
• Feed two to three times daily — as many insects as the dragon eats in 10 to 15 minutes.

Adults

• 70 to 80 percent vegetables, 20 to 30 percent insects. Adults need less protein and more plant matter.
• Daily greens: collard greens, mustard greens, dandelion greens, butternut squash, bell peppers.
• Insects two to three times a week — as a supplement, not the staple.
• Calcium dusting continues — the supplementation never stops.
• No iceberg lettuce — nutritionally empty and causes diarrhea.

Adult dragons on insect-heavy diets get obese and develop fatty liver disease. The vegetable ratio is health maintenance, not a preference.

What Never to Feed

• Fireflies/lightning bugs — toxic and fatal
• Avocado — toxic
• Rhubarb — toxic
• Spinach and kale in large amounts — oxalates bind calcium; small amounts occasionally are fine
• Wild-caught insects — pesticide exposure
• Citrus, onions, garlic — irritants

Hydration

• Misting daily — dragons lap droplets from leaves and surfaces, and often will not drink from a bowl.
• A shallow water bowl for soaking and occasional drinking — deep enough to soak, shallow enough that a dragon cannot drown.
• Weekly warm soaks — 15 to 20 minutes in shallow warm water, which supports hydration and shedding.

Shedding and Brumation

• Normal shedding happens in patches — do not pull loose skin; it comes off on its own or during soaks.
• Brumation is the reptilian version of hibernation — dragons slow down, eat less, and sleep more, usually in winter. It is normal, not illness.
• Brumation signs: hiding, refusing food, lethargy, sleeping in the coolest spot. It lasts weeks to months.
• During brumation: reduce light and heat gradually, offer food occasionally, do not force-feed. A vet visit rules out illness if the behavior seems abnormal.

New owners panic at brumation and rush to the vet — the behavior is normal, though a vet visit confirms it when the pattern seems off.

Health Problems to Watch

• Metabolic bone disease: rubbery jaw, limb deformities, tremors, difficulty walking — from missing UVB or calcium. Prevented entirely; advanced cases need immediate veterinary care.
• Impaction: from loose substrate ingestion — constipation, lethargy, loss of appetite. Loose sand is the usual cause.
• Mouth rot (stomatitis): pus, swelling, appetite loss — needs a vet.
• Respiratory infections: from temperatures too low or humidity too high — wheezing, mucus, open-mouth breathing. Vet visit.
• Parasites: from wild-caught insects or poor hygiene — annual fecal checks.

Find a reptile-savvy vet before you need one — not every small-animal clinic treats reptiles, and reptiles hide illness until it is advanced.

Frequently Asked Questions

Do bearded dragons need UVB?

Absolutely, and it is the most important element of the setup. Without UVB they cannot absorb calcium, develop fatal metabolic bone disease, and die. A UVB bulb, replaced every 6 to 12 months, with nothing between it and the dragon, is non-negotiable.

How long do bearded dragons live?

Eight to twelve years in proper conditions. Dragons without UVB or with insect-only adult diets often die within a few years. The setup is the lifespan.

Can I house two bearded dragons together?

Not recommended — they are territorial, and cohabitation causes stress, competition for food and basking spots, and sometimes injury or death. One dragon per enclosure.

My dragon stopped eating. Is it brumation or illness?

Timing and behavior distinguish them — brumation happens in cooler months, with lethargy and hiding but no other symptoms. Illness shows weight loss, abnormal stool, breathing changes, or symptoms outside the seasonal pattern. A vet visit when in doubt.

The Bottom Line

Forty gallons minimum, solid substrate, with a UVB bulb 10 to 12 inches from the basking spot — replaced every 6 to 12 months, nothing blocking the light. Basking at 95 to 105, cool side at 75 to 85. Juveniles eat 70 to 80 percent insects; adults flip to 70 to 80 percent vegetables — the ratio shift is health maintenance. Calcium with D3 at every feeding, multivitamin twice weekly, gut-loaded insects. Mist daily, soak weekly. Brumation is normal; metabolic bone disease is preventable; loose sand is the common killer. The UVB is the whole thing — skip it and the dragon dies slowly no matter what else is right.