What Goes Wrong With Pet Reptiles?

Health problems in pet reptiles are, in the great majority of cases, husbandry problems that arrive looking medical. The conditions we see most often in snakes, lizards, tortoises and turtles are not obscure tropical infections. They are the predictable consequences of a basking site a few degrees too cool, a UVB lamp that stopped doing its job months ago, air that is too dry or too stagnant, or a diet that never had enough calcium in it. Get those four things right and most of the list below never happens.

The second thing to understand is the delay. A reptile has no reason to advertise weakness, and its metabolism runs slowly enough that disease can advance for weeks or months without an obvious change. By the time an owner notices, the animal is usually further along than it looks. A dog with pneumonia looks ill on day two. A tortoise with the same problem may simply seem a little quiet for a month.

This article covers the problems that bring reptiles into the consulting room most often, the husbandry faults behind each one, and the signs that mean an animal needs veterinary attention today rather than next week.

What to Know Most illness in pet reptiles is caused by husbandry rather than infection: temperature, UVB, humidity and dietary calcium account for the bulk of cases. Reptiles conceal illness well, so a visibly unwell reptile has usually been unwell for weeks. A UVB lamp stops producing useful UVB long before it stops lighting up, which is why metabolic bone disease still appears in enclosures that look correct. Open-mouth breathing, any tissue protruding from the vent, a swollen closed eye, sudden tremors or a jaw that feels rubbery are not things to monitor at home. They need veterinary attention the same day. Never peel retained shed skin off a snake or a gecko.

Why Do Most Reptile Problems Start With the Enclosure?

A reptile cannot generate its own body heat. Everything it does biologically depends on reaching the right temperature by moving between a warm spot and a cool one. Digestion, immune response, the clearance of an infection, the healing of a wound and the absorption of calcium all slow down or stop when the animal cannot get warm enough.

That single fact explains why so much reptile medicine is really environmental correction. An antibiotic given to a snake kept at 24 degrees does very little, because the immune system it is meant to support is barely running. Warm the animal correctly and the same drug starts to work.

The second pillar is ultraviolet B light. Most diurnal lizards and all tortoises and turtles need UVB to make vitamin D3 in the skin, and without D3 they cannot absorb dietary calcium regardless of how much is in the bowl. Glass and plastic block UVB, so a lamp shining through a solid tank lid delivers almost nothing, and a mesh lid still removes a substantial share of what gets through. Light coming in through a window does not count either, however bright the room feels.

Humidity is the third. Too low and the animal cannot shed, becomes dehydrated and develops kidney problems. Too high, with poor airflow, and you get skin infections and fungal disease. Bengaluru makes this harder than it looks: the monsoon months push ambient humidity up while the December and January nights drop well below what most tropical species tolerate, and power cuts interrupt heating at exactly the wrong moment.

Target temperatures for the species we see most

Every species differs, and the numbers below are the published starting ranges for the animals we see most often. Confirm them for your exact species, measure at the level the animal actually sits rather than at the top of the tank, and use a thermostat rather than judgement.

Two thermometers and one hygrometer, checked daily, prevent more reptile disease than any medicine on our shelves.

What Is Metabolic Bone Disease and How Do I Spot It?

Metabolic bone disease is the commonest serious condition in young, fast-growing captive reptiles, and it is almost entirely preventable. The mechanism is straightforward. Without enough usable calcium, the body pulls calcium out of the skeleton to keep blood levels stable. Bone is replaced with soft fibrous tissue. The skeleton gradually loses the ability to hold the animal up.

Three faults produce it, usually together: no effective UVB, insect or plant diets that are naturally low in calcium and high in phosphorus, and no calcium supplementation. Crickets and mealworms fed straight from the tub are a calcium-poor diet. Dusting them, and feeding the insects well before they are offered, changes that.

The early signs are quiet and easy to dismiss. A jaw that feels rubbery rather than firm when gently pressed. Swelling along the forelimbs that looks like muscle but is fibrous tissue. A lizard that drags its belly instead of lifting it clear of the floor, or stops climbing. Twitching in the toes or the tail. In tortoises, a shell that yields slightly under the thumb, or scutes that start to peak upwards into pyramids.

The late signs are unmistakable and far harder to treat. Bones fracture from nothing more than normal movement. The spine curves. The animal cannot stand. Severe cases arrive in full-body tremor or seizure from critically low blood calcium, which is an emergency and needs injectable treatment straight away.

Treatment has two halves and neither works alone. The medical half is calcium and vitamin D3 supplementation, fluids, pain relief where fractures are present, and in acute cases injectable calcium. The husbandry half is a correct UVB lamp at the correct distance, a proper thermal gradient, and a diet that is genuinely supplemented. Soft tissue signs often improve well. Skeletal deformity that has already set does not reverse, which is why the early jaw check matters so much.

Why Is My Reptile Struggling to Breathe?

Respiratory disease is the second big category, and in captive reptiles it is nearly always secondary to something environmental. A cool enclosure, poor ventilation, long-term dehydration, hypovitaminosis A or the stress of a cramped set-up all suppress the defences of the airway. Bacteria that were already present then take hold.

The signs vary by species. Snakes develop mucus or bubbles at the nostrils, make clicking or whistling sounds, hold the head and neck raised, and in advanced disease breathe with the mouth open. Open-mouth breathing in a snake is never normal. Lizards show increased effort, puffing of the throat and a reluctance to bask. Tortoises classically show a runny nose and crusting around the nostrils, often with a swollen eye on the same side.

That tortoise picture has a specific and important cause. Upper respiratory tract disease in tortoises is frequently driven by Mycoplasma, which spreads between animals, can persist for life and may flare whenever the animal is stressed. A new tortoise added to an existing group without quarantine can infect the lot. Any tortoise with nasal discharge should be isolated and examined, not simply watched.

Diagnosis usually needs more than a look. Radiographs show how much lung is involved, and samples from the airway allow bacterial culture so that treatment is chosen rather than guessed. Treatment commonly combines systemic medication, fluids, nebulisation and, critically, raising the animal to the upper end of its correct temperature range so its immune system can work. Do not transport a sick reptile in a cold box. Wrap the carrier, keep it warm on the journey, and bring photographs of the enclosure and the actual lamp with you.

What Causes Shedding and Skin Problems?

Shedding is where husbandry faults become visible fastest. A healthy snake sheds in one complete piece, including the clear spectacle over each eye. A healthy gecko sheds cleanly from the toes and tail tip. When humidity is too low, when there is nothing rough to rub against, or when the animal is dehydrated, unwell or carrying mites, the shed comes away in patches and leaves rings of old skin behind.

Those rings matter more than they look. A band of retained skin around a gecko's toe or the tip of a tail acts as a tourniquet. The tissue beyond it swells, loses its blood supply and dies, and toes are genuinely lost this way. Retained eye caps in snakes leave the animal partially blind and set up infection underneath.

The single most important instruction here is not to pull. Peeling a stuck shed takes the living layer underneath with it and causes bleeding and scarring. The safe response is a shallow warm water soak, a damp hide to sit in, and an examination if the skin does not release on its own. Retained spectacles should only ever be removed by a vet.

Wet husbandry causes the opposite set of problems. Substrate that stays damp, especially with poor airflow, produces blister disease and scale rot on the belly scales, which begins as discoloured or raised patches and progresses to ulceration. Fungal skin disease behaves similarly and is slow to clear.

Burns deserve a separate mention because they are so common and so avoidable. Heat rocks and unguarded bulbs produce deep injuries, often across the back of a snake or the belly of a lizard, and a reptile will frequently stay in contact long enough to cause full-thickness damage. Guard every heat source, run it through a thermostat, and see a vet for any burn rather than treating it at home.

What Goes Wrong With Tortoises and Turtles?

Shell disease is the presentation owners recognise, and the one most often misjudged. Ulcerative shell disease, commonly called shell rot, starts with soft, discoloured, foul-smelling areas and can extend into the bone beneath. What looks like a superficial mark on the surface may be the top of a much deeper lesion. Assessment, debridement and sometimes dry docking are needed, along with correcting the water quality, basking access or trauma that allowed it to start.

Pyramiding is different and mostly permanent. Scutes that grow upwards into raised cones reflect a growth period with too much protein, too little calcium and often too little humidity. The shape does not revert once laid down, although correcting the diet stops it progressing.

Aquatic turtles bring a specific nutritional problem. A diet built on dried shrimp, or on pellets alone, is short of vitamin A. The result is swollen, closed eyelids, thickened skin and abscesses behind the ear that appear as firm bulges on the side of the head. Those abscesses need surgical drainage under anaesthesia, and the diet has to change to include dark leafy greens and appropriate whole prey.

Trauma is the other frequent reason a tortoise arrives with us. Free-roaming garden tortoises are injured by dogs, by vehicles in driveways and by falls, and dog bite injuries to a shell are far deeper than the external damage suggests. A cracked shell is a fracture and needs proper repair and pain relief.

Native Indian tortoises and turtles are not pets

Native species including the Indian star tortoise and the Indian flapshell turtle are protected under the Wildlife (Protection) Act, so keeping them as pets is an offence regardless of how the animal was acquired. We see them regularly, often bought in good faith at a market. A veterinary practice will always treat an animal that is suffering, but the lawful route for a protected native species is the state forest department or a recognised rescue centre, not continued private keeping. Releasing a non-native turtle such as a red-eared slider into a local lake is also harmful, because they outcompete native species.

Do Pet Reptiles Get Parasites?

Yes, and far more often than owners expect, particularly in animals that were wild-caught or bought from a mixed collection with no quarantine.

Snake mites are the ectoparasite we see most. They appear as tiny dark specks moving around the eyes, chin and vent, or as flecks of grit in the water bowl after the snake has soaked itself to relieve the irritation. A snake that suddenly starts spending long periods in its water should be checked carefully. Heavy infestations cause anaemia, poor shedding and secondary skin infection, and they spread readily between enclosures on hands and equipment.

Internally, roundworms, pinworms and the protozoal parasites dominate. Coccidia are common in bearded dragons and produce watery, foul droppings, weight loss and poor growth in young animals, and they are difficult to eliminate from an enclosure without thorough disinfection. Cryptosporidium in snakes causes chronic regurgitation and a persistent mid-body swelling, carries a poor outlook and is a strong argument for quarantining any new arrival.

A faecal examination is cheap, quick and the only way to know what is present. Bring a fresh sample to any appointment for a reptile that is losing weight, regurgitating or passing abnormal droppings. Blanket worming without a diagnosis is a poor substitute, because the common parasites need different drugs and some of them need environmental decontamination rather than more medication.

Household hygiene around a healthy-looking reptile

Many reptiles carry Salmonella in the gut as part of their normal flora, and shedding comes and goes in an animal that is behaving perfectly well. A negative test today does not mean the animal is clear next month, so hygiene has to be routine rather than a response to illness. Keep one bucket and one scrubbing brush for enclosure work and store them outside the kitchen. Soak and bathe reptiles in a dedicated tub, never in a sink or bath used by people. Wash hands with soap and water, not gel alone, after handling the animal, its water bowl, its substrate or its food. Set the enclosure away from food preparation surfaces and dining tables.

Children under five put hands to mouths before anyone can intervene, which is why supervision matters more than instruction at that age. Households with infants, with anyone pregnant, or with anyone on immunosuppressive treatment should think carefully before keeping reptiles at all. If a family member develops diarrhoea and fever and there is a reptile in the house, say so to the treating doctor. It changes which tests are worth running.

Can a Female Reptile Have Egg Problems Without a Male?

Yes, and this surprises almost every owner who meets it. Female lizards and tortoises produce follicles and can lay infertile eggs with no male ever present. Bearded dragons do this readily, often repeatedly, and the reproductive problems that follow are among the commonest emergencies in pet lizards.

Two distinct conditions occur. In dystocia, or egg binding, eggs have formed but cannot be passed, usually because there is no suitable site to dig, because the animal is calcium-depleted and lacks the muscular strength to push, or because an egg is malformed or oversized. In follicular stasis, follicles develop on the ovaries and then fail to progress or regress, leaving the abdomen filled with material the body cannot clear.

The signs overlap and are easy to attribute to something else. A female goes off food while her abdomen looks full or lumpy. She becomes restless and digs persistently, then becomes still and weak. She strains at the vent without producing anything. Any tissue protruding from the vent is an emergency and needs the same-day attention, kept moist and clean on the journey.

Diagnosis uses radiographs and ultrasound to tell eggs from follicles, since the treatments differ. Some cases pass eggs with warmth, fluids, calcium and a properly prepared laying box. Others need surgery, and for a female with recurrent problems, removal of the ovaries is often the kindest long-term answer rather than managing one episode after another. Offering a deep, slightly damp digging box to any adult female lizard or tortoise prevents a reasonable share of these cases outright.

Why Has My Reptile Stopped Eating?

Refusing food is the sign owners notice first, and it is the least specific sign in reptile medicine. Almost everything on this page can cause it. The question that separates a normal pause from a problem is whether the animal is losing weight.

Some reduction is genuinely normal. Many species slow down as day length and temperature fall, and a tortoise or a corn snake may eat little through the cooler months. Male bearded dragons often refuse food during the breeding season. A snake will usually stop eating for a few days before and during a shed, which you can predict from dull skin and cloudy eyes.

What is not normal is weight loss, and that is why scales are the most useful piece of equipment a reptile keeper can own. Weigh the animal on the same day each week and write it down. A stable weight with reduced intake is usually seasonal. A falling weight is a medical problem whatever the season.

The medical causes cluster into a few groups. Pain and oral disease, particularly infectious stomatitis, where the gums look red and there is cheesy material around the teeth. Parasites. Respiratory disease. Reproductive disease in females. Impaction, where substrate, an oversized meal or dehydration at low temperature has stalled the gut, giving a firm abdomen and no droppings. Kidney disease and gout, often following long-term dehydration or a diet too high in protein.

Before assuming illness, check the basics with a thermometer rather than a hand: warm end temperature, cool end temperature, humidity, the age of the UVB lamp, when the animal last passed droppings, and whether it has somewhere to hide. Correct anything wrong, give it a fortnight, and book an examination if intake has not recovered or weight is still falling.

Which Signs Mean I Should See a Vet Today?

Reptiles tolerate a great deal before showing it, so the threshold for seeking help should be lower than it would be for a dog or a cat. Some signs allow a few days of husbandry correction. Others do not.

Bring three things to the appointment and the consultation becomes far more useful: photographs of the whole enclosure with the lamps switched on, the actual UVB lamp or at least its make and the date it was fitted, and a fresh faecal sample. A reptile consultation is largely an environmental investigation, and those details answer questions that no examination of the animal alone can.

Transport matters too. Keep the carrier warm, dark and quiet, use a towel-lined box rather than an open tank, and do not feed immediately before travelling. If you are not sure whether something is urgent, phone and describe it. We would far rather triage a reptile over the phone than see it a fortnight later.

Frequently Asked Questions

Next Steps

If your reptile is breathing with its mouth open, has tissue protruding from the vent, is tremoring or cannot right itself, treat it as urgent. Keep the animal warm, keep any exposed tissue moist and clean, and phone us on the way in rather than waiting for the next convenient appointment. Delay costs more in a reptile than in a dog, because the animal was already compensating before you noticed.

If nothing is urgent, spend an hour on the enclosure before anything else. Measure the warm end and the cool end at the height the animal sits. Check the date on the UVB lamp and replace it if you cannot remember fitting it. Check humidity, check that there is a hide and somewhere to dig, and start weighing weekly. Those checks resolve a surprising number of problems without any medical input at all.

For anything that persists, or for a new animal that has never had a health check, book an examination with our exotics team. We will go through the set-up with you, examine the animal properly, run a faecal test and arrange radiographs where they are needed. Bring your photographs and your lamp, and bring the questions you have been meaning to ask.