Every reptile keeper will face a health scare at some point. The frustrating reality is that reptiles are masters at hiding illness — they evolved in environments where showing weakness means becoming something’s lunch. By the time a bearded dragon like Ember starts acting lethargic or a ball python refuses its fourth consecutive meal, the underlying problem has often been building for weeks. Catching illness early starts with knowing what “normal” looks like for your specific animal on a specific day.
The good news: most common reptile health problems are preventable, and many respond well to early intervention. The bad news: a sick reptile needs a veterinarian who actually works with reptiles — not every general-practice vet has the training. This guide covers the conditions you’re most likely to encounter, what they look like, what causes them, and when the situation has moved beyond home management. It’s a companion to the individual species care guides on this site, not a replacement for professional diagnosis.
We run hands-on reptile experiences across the GTA and keep a rotating cast of animals — bearded dragons, tortoises, ball pythons, tarantulas, and more. These aren’t academic health notes. They’re the conditions we’ve either dealt with directly or seen come through the door when families reach out for advice after a purchase gone wrong.
Key Takeaways
- Reptiles mask illness — behavioural changes (hiding more, eating less, reduced activity) are often the first and only early warning sign
- Metabolic bone disease (MBD) is the most common preventable condition in captive reptiles and is caused by insufficient UVB and dietary calcium
- Respiratory infections present as wheezing, mucus around the nostrils, and open-mouth breathing — always require a vet visit
- Impaction (gut blockage) is a medical emergency and is frequently linked to loose substrate like sand and to oversized feeder insects
- Stuck shed (dysecdysis) is usually an enclosure humidity problem, not a disease — fix the environment, and it resolves
Why Reptiles Hide Illness — and Why Your Baseline Matters
Prey animals don’t advertise pain. A wild tortoise that moves slowly becomes food. A lizard that wheezes attracts predators. This instinct persists in captivity — which means the reptile sitting quietly in the corner of its enclosure might be perfectly content, or it might be in the early stages of a respiratory infection. You cannot tell without a baseline.
Spend time observing your animal when it’s healthy. What does a normal shed cycle look like? How does it behave in the hour before feeding? Does it bask every morning or rotate between spots? Note typical body weight (a kitchen scale in grams works perfectly). When something looks “off,” you’ll actually know what it looks like when things are on.
Metabolic Bone Disease (MBD)
Metabolic bone disease is the single most common preventable condition in captive reptiles, and it is entirely a husbandry failure. It occurs when a reptile’s body can’t maintain adequate calcium levels — either because dietary calcium is too low, because the calcium-to-phosphorus ratio is wrong, or because without adequate UVB light the animal can’t synthesise vitamin D3 to absorb calcium in the first place.
What Causes MBD
The most common culprits are insufficient UVB lighting (or bulbs that have degraded past usefulness without being replaced), a diet heavy in high-phosphorus feeder insects like mealworms without calcium supplementation, and feeding calcium-blocking foods like spinach or oxalic-acid-rich greens. Many new keepers don’t realise that UVB bulbs lose effectiveness long before they stop visibly glowing — most should be replaced every 6 to 12 months.
Symptoms to Watch For
Early signs are subtle: slight trembling in the limbs, reduced appetite, a softening of the jaw. As MBD progresses, you’ll see visible limb deformities, a rubbery jaw that bends when pressure is applied, pathological fractures, and in severe cases, whole-body tremors and seizures. In baby bearded dragons — where MBD develops fastest because of rapid growth — you may notice a “banana peel” curve to the spine or hind legs that splay outward during movement.
Treatment and Prevention
Early MBD responds well to corrected husbandry plus oral or injectable calcium supplementation from a vet. Advanced MBD leaves permanent damage. Prevention is straightforward: provide appropriate UVB for the species, dust feeders with calcium + D3 powder 2–3 times per week, and follow species-appropriate diet ratios. Our complete reptile diet guide covers the right calcium-to-phosphorus approach for each species we keep.
Respiratory Infections
Respiratory infections (RI) are common in snakes and lizards kept at temperatures below their species’ requirements. Cold conditions suppress the immune system directly — a ball python kept at 22°C instead of 28–32°C is biologically incapable of fighting off bacteria the way a properly warmed animal can.
Symptoms
Classic signs: wheezing or crackling sounds during breathing, mucus around the nostrils or mouth, the animal holding its head elevated or tilted (especially in snakes trying to drain fluid from the lungs), and open-mouth breathing that isn’t associated with thermoregulation. Snakes with RI sometimes “star-gaze” — tilting the head upward at an odd angle. Any open-mouth breathing in a resting reptile is a red flag.
What to Do
RI always requires veterinary diagnosis and typically antibiotic treatment. At home: make sure temperatures are dialled in correctly (measure with a digital probe thermometer, not the dial type), increase ventilation to reduce humidity if you’re keeping a desert species, and isolate the affected animal from others. Do not “wait and see” on respiratory symptoms — bacterial RIs escalate quickly, and a mild case can become pneumonia within days.
Impaction
Impaction means the digestive tract is physically blocked — usually by substrate material that was ingested accidentally while hunting prey, or by a feeder insect that was too large for the animal to pass. It’s a medical emergency.
Causes
Loose particle substrates — calcium sand, fine reptile sand, walnut shell, even some brands of coconut fibre — are the most common impaction cause in bearded dragons and leopard geckos. Young animals are at highest risk because their gut transit is slower and their digestive acid less potent. Feeders that are larger than the space between the animal’s eyes are also a risk, as they may not fully digest before the next feeding. Cold temperatures slow digestion significantly and increase impaction risk even on safe substrates.
Symptoms
Watch for complete loss of appetite, a noticeably distended abdomen, straining during defecation or absence of bowel movements for more than 2 weeks (species-dependent), and hind-leg weakness or dragging (the blockage can press on the spinal cord). In severe cases the animal becomes completely unresponsive to stimulation.
Prevention and Treatment
Switch to impaction-safe substrates for juveniles: paper towel, reptile carpet, ceramic tile, or bioactive mixes with appropriate particle size. Feed appropriately sized prey items. If you suspect impaction, a warm bath for 15–20 minutes can sometimes stimulate defecation, but confirmed impaction requires an X-ray and potentially surgical or endoscopic intervention. Our reptile enclosure setup guide covers safe substrate choices by species age and type.
Stuck Shed (Dysecdysis)
Healthy shedding requires adequate moisture. When the humidity is too low — or the animal is dehydrated, nutritionally deficient, or has skin damage — the old skin doesn’t release cleanly. Retained shed on the toes is the most dangerous outcome, cutting off circulation and leading to necrosis and toe loss within days.
Why It Happens
Enclosure humidity is the primary cause. Most snakes need 60–70% humidity during a shed cycle; corn snakes and ball pythons in particular often shed badly in Canadian winters when forced-air heating strips moisture from the air. Leopard geckos need a moist hide — a small covered container with damp sphagnum moss — available all the time so they can seek humidity when they need it. External parasites and skin infections can also cause patchy, stuck sheds.
How to Help
If your reptile is struggling with a shed, give a 20-minute warm soak in shallow, body-temperature water (30°C / 86°F). After soaking, gently wrap the animal in a damp warm towel for a few minutes, then attempt to roll the remaining shed off — never pull directly or you risk tearing the new skin beneath. For stuck shed specifically on the toes or eye caps, soak first, then use a damp cotton swab with very gentle circular motion. Eye-cap retention that doesn’t resolve with soaking needs a vet visit; attempting to remove a retained eye cap without experience usually causes permanent eye damage.
Parasites — Internal and External
Parasites split into two categories: external (mites and ticks) and internal (pinworms, coccidia, flagellates, and others). Newly acquired reptiles — especially wild-caught or second-hand animals — should be checked by a vet and have a faecal float done before being introduced to an existing collection.
External mites are the most urgent concern for immediate action. They spread rapidly in a collection, they irritate and stress the animal, and a heavy infestation on a small or young reptile can cause dangerous anaemia. For full detail on identifying a mite infestation, treating the animal, and sterilising the enclosure, see our dedicated guide to reptile mites.
Internal parasites are managed through faecal testing at your reptile vet. Low-level parasite loads in otherwise healthy wild-caught animals are common and sometimes left untreated if not causing clinical signs — your vet will advise. High loads, or parasites in immunocompromised animals, require targeted antiparasitics.
Mouth Rot (Infectious Stomatitis)
Mouth rot is a bacterial infection of the oral cavity and is particularly common in snakes. It usually starts after a small wound — a feeding strike that hit the enclosure wall, a cage injury, or a bite from a live feeder that fought back. Look for: yellow or grey caseous (cottage-cheese-like) discharge at the gumline or between the teeth, swelling around the jaw, the animal reluctant to eat or rubbing its face on surfaces, and visible reddening or tissue necrosis inside the mouth.
Mild mouth rot can be treated with antiseptic oral rinses under veterinary guidance, but anything with visible tissue death or spreading discharge needs antibiotics — both topical and systemic. Never feed a reptile with active mouth rot; the stress of a prey response and the risk of the prey injuring already-compromised tissue can worsen the infection rapidly. Switch to tongs-feeding until cleared.
Health Problem Quick Reference
| Condition | Primary Symptom | Most Likely Cause | Urgency |
|---|---|---|---|
| Metabolic Bone Disease | Limb trembling, soft jaw, deformity | Insufficient UVB + calcium | Vet soon; emergency if seizures |
| Respiratory Infection | Wheezing, mucus, open-mouth breathing | Low temperatures, bacteria | Vet within 24–48 hours |
| Impaction | No defecation, swollen abdomen, rear-leg weakness | Loose substrate, oversized prey | Emergency vet |
| Stuck Shed | Retained skin, especially on toes/eye caps | Low humidity, dehydration | Address within 24 hours; vet if eye caps |
| External Mites | Tiny black/red dots on skin, hiding in water | New animal introduction, contaminated substrate | Treat within 24 hours; isolate immediately |
| Mouth Rot | Yellow discharge at gumline, swollen jaw | Oral wound, bacterial infection | Vet within 24–48 hours |
When to Call a Reptile Vet — and How to Find One
The threshold for calling a vet should be low. Signs that mean “today, not next week”: any open-mouth breathing at rest, suspected impaction, active seizures or full-body tremors, wounds that appear infected or aren’t healing, complete anorexia lasting more than 4 weeks in an otherwise healthy adult (less in juveniles), sudden and dramatic weight loss, and any retained eye cap. When in doubt, call — most exotic vet clinics will triage a phone enquiry and tell you whether the situation is urgent.
Finding a reptile-knowledgeable vet in the GTA: search for “exotic animal veterinarian” plus your city. In the Greater Toronto Area, several clinics offer reptile services; look specifically for vets who list “exotic companion animals” or “herptiles” in their specialties. Ask directly: “Do you see bearded dragons regularly? Do you have an exotic-animal vet on staff?” A vet who only sees dogs and cats once or twice a year is not the right fit for a reptile emergency.
Our team at Toronto Reptiles keeps up-to-date relationships with local exotic vets through our work with the animals we bring to every event. If you’re in the GTA and need a referral direction, reach out and we’ll point you toward who we trust.
Frequently Asked Questions
My reptile hasn’t eaten in two weeks. Should I be worried?
It depends on the species, age, and circumstances. Adult ball pythons commonly refuse food for weeks or months, especially around breeding season, without any underlying health issue. Adult corn snakes or bearded dragons refusing food for more than 3–4 weeks without a known trigger (breeding season, brumation preparation, shed cycle) warrant a vet visit and weight check. Juveniles of any species that refuse more than 2 consecutive feedings need prompt attention — their reserves are low and they deteriorate fast.
What does a healthy reptile faecal sample look like?
A normal solid stool is firm and dark brown or black, often with a separate white urate component (reptiles excrete uric acid, not urea, so there’s no liquid urine). Runny, particularly foul-smelling, bloody, or foamy droppings, or droppings with visible worms, are abnormal and warrant a faecal float at your vet. One off-specimen isn’t a crisis; consistent abnormality over several droppings is.
Can I catch anything from my reptile?
Salmonella is the primary zoonotic concern with reptiles. It lives on the skin and in the gut of most reptiles without causing them any illness, but it can cause serious gastroenteritis in humans, particularly young children, elderly people, and immunocompromised individuals. The prevention is straightforward: wash hands with soap immediately after handling any reptile or cleaning its enclosure, don’t kiss reptiles or let them near food preparation areas, and don’t let very young children (under 5) handle reptiles unsupervised. We follow strict handwashing protocols at every Toronto Reptiles event — the animals are safe to interact with when basic hygiene is observed.
How do I know if my reptile is dehydrated?
The skin tent test works for larger lizards: gently pinch a fold of loose skin on the side of the body and release. In a well-hydrated animal it snaps back immediately. In a dehydrated animal it stays tented. Sunken eyes, wrinkled or loose skin overall, and infrequent urination (very few urates) are also indicators. Offer a shallow soak in warm water for 20–30 minutes; most reptiles will drink from the water or absorb it dermally during the soak. Persistent dehydration despite access to water suggests an underlying problem.
Is it normal for my reptile to lose colour before a shed?
Yes, completely. The dull, milky appearance — especially the blue or grey cast over the eyes — is caused by the lymphatic fluid that separates the old skin from the new one beneath. It typically lasts 3–7 days. During this time the animal may refuse food, hide more, and be more defensive than usual. The eyes will briefly clear up about 24–48 hours before the shed completes. This is normal and is not a sign of illness.
My bearded dragon’s legs are shaking. What’s wrong?
Leg trembling in bearded dragons is almost always metabolic bone disease until proven otherwise. The immediate steps: check your UVB bulb — is it less than 12 months old? Is it the right output for a desert lizard (a 10.0 T5 HO tube is the current standard)? Is the bulb the right distance from the basking spot? Start supplementing with calcium + D3 if you haven’t been. See a vet promptly — early MBD is reversible; advanced MBD causes permanent deformities. Do not give calcium supplements in place of veterinary diagnosis; the vet can confirm MBD via X-ray and assess severity.
Can I treat my reptile’s illness at home without a vet?
Husbandry corrections (fixing temperatures, humidity, substrate, lighting, diet) are always appropriate to do immediately and often resolve enclosure-driven conditions like stuck shed or early MBD. However, any condition with a bacterial or parasitic cause requires prescription medication — antibiotics and antiparasitics appropriate for reptiles are not available over the counter in Canada, and human or dog/cat medications dosed at the wrong level are frequently fatal to reptiles. Self-treating an RI or skin infection with iodine soaks and hoping is not a safe substitute for professional diagnosis.
The healthiest reptiles in captivity are in the hands of keepers who know their animals well enough to notice when something shifts. If you’d like to see what a well-cared-for bearded dragon, tortoise, or corn snake looks like up close — and ask a handler who works with them daily any questions you have — book a Toronto Reptiles experience for your next event. The animals you meet are healthy, regularly vet-checked, and kept to the same standards we write about here.