Leopard geckos are one of the most common reptiles on Ontario’s secondhand market. They’re small, quiet, and easy to transport — which means they circulate through rehoming ads constantly, and they can look deceptively healthy to someone who doesn’t know the species. The markers that matter in a leo are subtle: tail girth, toe condition, eye clarity. A gecko with a fat tail and bright, alert eyes is almost certainly in good shape. One with a thin, wrinkled tail and slightly sunken eyes may be weeks into a slow decline that the seller hasn’t noticed.
There’s also a parasite risk specific to leopard geckos that most buyers never hear about until it’s too late: Cryptosporidium, a protozoan parasite that is common in captive gecko populations, causes chronic wasting, and has no reliable cure. It’s one of the reasons we take leo rehoming seriously and recommend a quarantine protocol every time.
This guide walks you through a practical, body-part-by-body-part health inspection for evaluating a leopard gecko at pickup, along with the questions to ask before you leave home. If you’re new to the species, read our complete leopard gecko care guide first — it gives you the baseline knowledge that makes this inspection meaningful. And if you’ve already decided to buy privately, our Ontario reptile buyer’s guide covers the general red flags and platform-specific risks in Ontario’s secondhand reptile market.
Key Takeaways
- The tail is your primary health gauge — a plump, round tail indicates good fat reserves; a thin, wrinkled, or flat tail is a warning sign
- Body weight matters: a healthy adult leo weighs 45–90g depending on sex; significantly underweight animals need veterinary attention
- Check every toe for retained shed — it can cut off circulation and cause toe loss within days of a bad shed
- Cryptosporidiosis is the hidden risk in secondhand leos — chronic weight loss with normal or increased appetite is the key symptom to ask about
- Alert, reactive eyes are a positive sign; sunken, cloudy, or half-closed eyes during the day are red flags requiring follow-up
- Always quarantine any new gecko for 60–90 days in a completely separate space from your existing collection
Before You Drive: Questions to Ask the Seller First
These questions serve two purposes: they gather information and they signal to the seller that you’re a knowledgeable buyer. Sellers who have cared for the animal well will be comfortable answering specifics. Vague or defensive answers are informative in their own right.
- How old is the gecko, and where did you get it? This tells you whether it’s store-bought (and which store), captive-bred private, or previously rehomed itself — each with different care-history implications.
- What does it weigh right now? An adult female should be 50–80g, adult male 60–90g. Hatchlings and juveniles will be lighter, but the key is whether weight is appropriate for age and sex.
- What’s it been eating, and when did it last eat? Leos should eat every 2–3 days as adults. “It ate last week” is fine. “It’s been refusing food for a month” combined with noticeable weight loss is a Crypto red flag.
- What’s the heat source, and what are your hot-spot and cool-side temps? Correct setup uses an under-tank heater (UTH) or heat mat connected to a thermostat, with the warm side hitting 29–32°C (85–90°F) and the cool side sitting around 22–26°C (72–79°F). A heat lamp alone is incorrect for this species.
- Is it currently shedding, and has it had any retained shed? Retained shed on toes is the most common husbandry-related health issue in leos. Has it had any? Was it resolved?
- Has it seen a vet? Any health history to know about? Even one vet record is meaningful. Completely undocumented health history for a multi-year animal is a signal to be more thorough in your inspection.
The On-Doorstep Health Check
Ask to handle the gecko yourself. A healthy leo will be alert and reactive — not aggressive, but aware. It will track your movements and grip your hand purposefully. A gecko that hangs limply, keeps its eyes closed, or is unresponsive to touch is showing signs of serious lethargy that warrants a vet visit before any transaction.
Tail Condition — Your Primary Weight Gauge
The tail is the most important visual health indicator in a leopard gecko. Leos store fat reserves in their tails, and tail condition tracks nutritional status better than any other external marker. A healthy adult tail is round, plump, and at least as wide at its base as the gecko’s neck. As you look at the tail from above, it should not narrow sharply near the body — it should maintain width for the first third of its length before tapering.
A thin, flat, or heavily wrinkled tail means the gecko has been drawing down its fat reserves — either through inadequate feeding, chronic stress, or illness. Thin tails in otherwise-active geckos can recover with consistent feeding. A very thin tail combined with muscle wasting in the rest of the body (bony spine, hollow flanks) is a more serious situation that requires veterinary assessment before purchase.
Also check for tail drops (autotomy). A regenerated tail — shorter, stubbier, and different in texture than the original — is common and doesn’t affect the animal’s health or quality of life. It’s worth knowing about going in, and sellers should disclose it unprompted.
Body Weight and Musculature
Hold the gecko in your palm and feel the ribcage area. In a well-fed gecko, the sides should feel rounded, not sharply concave. Run your finger gently along the spine — individual vertebrae should not be sharply prominent. A healthy leo at rest will feel substantial and solid for its size. If it feels like you could count individual bones through the skin, the animal is underweight.
Healthy adult weight reference (these are ranges — individual variation is real):
| Age / Sex | Healthy Weight Range | Concern Threshold |
|---|---|---|
| Hatchling (0–3 months) | 4–10g | Under 3g warrants vet review |
| Juvenile (3–12 months) | 15–40g | Below 12g at 6 months: inadequate feeding |
| Adult female (12+ months) | 50–80g | Under 40g: significantly underweight |
| Adult male (12+ months) | 60–90g | Under 45g: significantly underweight |
| Large adult male (“giant” or older) | 90–120g | Over 120g may indicate obesity (unusual) |
Eyes — Clarity, Shed, and Alertness
Leopard gecko eyes should be round, clear, and fully open during the animal’s active period (which, being nocturnal, may be limited if you’re visiting during the day — some leos are drowsy during daylight). What you’re checking for:
- Retained eye caps: After shedding, leos occasionally retain the spectacle (the clear scale covering the eye) rather than shedding it cleanly. Retained caps appear as a slightly raised, dull, or misshapen area over the eye. They’re common and treatable with a warm soak and careful assistance, but multiple retained sheds stacked on the same eye can lead to pressure damage. Ask if the gecko has a history of retained eye caps.
- Discharge: Any watery, crusty, or mucoid material around the eye socket is abnormal. Clear, watery discharge can indicate a respiratory issue; thick or crusty discharge indicates infection.
- Sunken eyes: Slight inward recession of the eyes is a dehydration marker. Mildly sunken eyes in a gecko that’s been recently moved are not necessarily alarming, but combined with a thin tail, they indicate an animal that has been under-cared for.
Toes and Digits — The Retained Shed Check
This is one of the most important checks for leos, and most buyers skip it. Look at every toe on every foot. Retained shed on toes appears as a ring of dry, papery, slightly constricting skin — often with the toe appearing pinched or slightly darker at the tip. If you see this, ask when the gecko last shed and whether the seller noticed it. Retained shed on toes can cut off circulation within days of a shed if not addressed, leading to permanent loss of digit tips.
A gecko with multiple toes showing retained shed has been living in an enclosure that’s too dry, and the seller hasn’t been monitoring shedding closely. Both facts are worth knowing. Retained shed is easy to treat — a 20-minute warm soak and gentle assistance with a damp cotton swab usually resolves it — but it tells you that husbandry attention has been inconsistent.
Vent Check
Turn the gecko over gently and look at the vent area. It should be clean, closed, and free of swelling. Watery or discoloured staining around the vent can indicate diarrhea — potentially from parasites, bacterial infection, or Cryptosporidium. Any prolapsed tissue (soft pink tissue visible at the vent opening) is a medical emergency. In males, the hemipenal area on either side of the vent should be symmetrical — swelling on one side can indicate hemipenal prolapse or infection.
Behaviour and Alertness
Even a nocturnal gecko should have some baseline reactivity when handled. A healthy leo will grip your hand, flick its tongue occasionally, and respond to visual stimuli nearby. An animal that is utterly limp, unresponsive, or struggles to hold its head up is in serious physiological distress. Some lethargy is normal post-shed or in a cold environment — but at room temperature and with consistent handling, a healthy leo should show clear signs of awareness.
Cryptosporidiosis — The Hidden Risk in Secondhand Leos
This deserves its own section because it’s the most serious disease risk in the secondhand leopard gecko market and it’s one that buyers rarely know to ask about.
Cryptosporidium saurophilum is a protozoan parasite that infects the intestinal lining of leopard geckos. The classic presentation is chronic weight loss despite normal or even increased appetite — the gecko keeps eating, but it can’t absorb nutrients properly because the parasite is disrupting the intestinal lining. Advanced cases show progressive muscle wasting, an increasingly wrinkled skin appearance, and eventually death. There is no reliable cure. Supportive care can extend quality of life, but an infected gecko remains a lifelong carrier and a risk to any other gecko in the collection.
Crypto spreads easily — fecal-oral transmission means shared feeders, shared equipment, and any contact between geckos can spread it. It’s one of the primary reasons for strict quarantine protocols.
What to ask: “Has this gecko ever been tested for Crypto?” and “Has it had any episodes of weight loss while still eating?” The second question is the more revealing one — many sellers won’t know what Crypto is, but they can tell you whether the gecko has been eating normally while consistently losing weight.
What to look for: A gecko with a very thin tail and overall muscle wasting despite apparently eating normally is the Crypto presentation. Skin that hangs in visible folds rather than sitting close to the body, combined with persistent weight loss and loose stool, is a strong Crypto indicator.
If you have concerns after purchase, a PCR fecal test is the most reliable diagnostic available in Canada. Standard fecal floats will not detect Cryptosporidium — you need to specifically request PCR or ELISA testing.
Enclosure Conditions — What the Setup Reveals
Spend five minutes scanning the enclosure before you look at the animal. The enclosure is a physical record of the care the gecko has received — it can’t be faked in the same way that a quick clean-up of the animal can.
| Element | Good Sign | Red Flag |
|---|---|---|
| Heating | Under-tank heater on a thermostat; digital thermometer visible; warm side 29–32°C (85–90°F) | Heat lamp only; no thermostat; “I keep the room warm” |
| Substrate | Paper towel, tile, reptile carpet, or bioactive | Loose sand, calci-sand, walnut shell, bare glass |
| Hides | Two hides minimum: one on warm side, one on cool side; humid hide with moist substrate | Single hide; no moist hide; nowhere for the gecko to fully conceal itself |
| Water dish | Shallow dish, fresh water present | No water dish or empty/dry dish |
| Enclosure hygiene | Clean substrate, no old food or mealworm casings | Accumulated old substrate, feeder insect carcasses, obvious odour |
| Temperature access | Seller can show current temps with a digital gun or fixed thermometer | No thermometer; “it’s on all the time so it’s fine” |
Red Flags — Walk Away If You See These
- Severe muscle wasting with normal appetite history — high Crypto suspicion. Requires PCR testing before any commitment.
- Prolapsed tissue at the vent — veterinary emergency, do not transport without vet involvement.
- Open-mouth breathing, wheezing, or clicking sounds when breathing — respiratory infection, requires antibiotic treatment.
- Active retained shed on multiple toes with dark or necrotic tip tissue — tissue may already be dying; requires vet involvement, not just a warm soak.
- Watery or bloody stool in the enclosure — possible parasitic infection or bacterial gastrointestinal issue.
- Unresponsive at room temperature with no recent shed cycle to explain lethargy — systemic illness of unknown cause.
Transport Home
- Use a small, ventilated plastic container lined with paper towel — a 1L to 2L deli container with holes punched in the lid is ideal. Keep it in a bag or box so the gecko can’t see out, which reduces stress.
- Keep transport warm — 22–26°C (72–79°F) ambient. In cold weather, wrap the container in a small towel and put a hand warmer nearby (not touching the container directly).
- Drive directly home — avoid stops. A 20-minute trip is infinitely better than a 60-minute trip with errands.
- Have the enclosure ready before you leave — warm side at temperature, hides in place, water dish filled. The gecko should be able to settle immediately on arrival.
- Do not handle for 48–72 hours post-arrival. Give the animal time to acclimate before interaction.
- Quarantine for 60–90 days if you have other geckos — completely separate from your existing collection, with no shared equipment or feeders.
A vet checkup within two weeks is worth doing regardless of how healthy the animal appeared. Request a PCR fecal test specifically for Cryptosporidium if you have any concern at all — it’s a straightforward add-on to a standard reptile exam, and catching Crypto early gives you the clearest picture of what you’re managing going forward. For everything you need to know about setting up the enclosure correctly once the gecko is home, our complete leo diet guide covers feeding and supplementation in detail.
Consider Adopting Instead
Rehoming from a private seller is often a perfectly reasonable choice, and this guide gives you the tools to do it well. But it’s worth knowing that Toronto Reptiles’ adoptable geckos come with something private listings can’t offer: a health assessment from people who have been keeping reptiles for over 20 years and who have held and watched the animal over weeks, not minutes. We know what the animal eats, how it behaves under stress, and whether it has any health concerns going in.
If you’d rather skip the uncertainty, see who’s looking for a home — we update our adoptables regularly and can match you with an animal that fits your experience level and setup. If you’re a keeper who needs to surrender a leopard gecko, you can submit a surrender request any time — rehoming to a rescue that will properly place the animal is the right decision, and we’re not here to judge why you’re making it.
Frequently Asked Questions
What does a healthy leopard gecko look like?
A healthy leopard gecko has a round, plump tail that is at least as wide at the base as the gecko’s neck. The body is well-muscled without visible ribs or spine. Eyes are clear, open, and reactive. The vent is clean and closed. Toes have no retained shed. The gecko is alert and grips your hand when held. In terms of colouration, leos vary widely by morph, but the skin should look taut and even — not hanging in folds or showing a “shrink-wrapped” appearance over the body.
How can I tell if a leopard gecko has Crypto?
Chronic progressive weight loss while continuing to eat is the signature presentation. The gecko keeps eating — sometimes eating more than usual — but continues to lose weight, with the tail thinning and muscle mass decreasing over weeks and months. Advanced Crypto often shows as a “stick figure” appearance: a gecko that looks almost skeletal with hanging skin folds despite still eating. The only reliable way to confirm it is PCR fecal testing. Standard fecal floats will not detect Cryptosporidium.
Is it okay to buy a leopard gecko without papers?
Most leopard geckos are sold without formal “papers” — this is normal in the private reptile market. What matters isn’t paperwork but care history: feeding records, a vet visit record, and the seller’s ability to answer specific questions about husbandry. A seller who can tell you the gecko’s current weight, what it ate last week, and what their thermostat is set to is providing you with more useful information than a certificate of purchase would.
How long do I need to quarantine a new leopard gecko?
A minimum of 30 days, and 60–90 days if you have any other geckos in the house. Cryptosporidium, pinworms, and various bacterial infections can be present with no visible symptoms. Quarantine in a completely separate room, use separate equipment (feeding tongs, dishes, substrate tools), and wash hands between rooms. Don’t share feeder insects between the quarantine animal and your established collection.
What should I do if the gecko I bought has retained shed on its toes?
Give the gecko a 20-minute warm soak in shallow lukewarm water (depth should not exceed the gecko’s belly). After soaking, gently attempt to roll the retained shed off with a slightly damp cotton swab or a piece of damp paper towel. Do not forcibly pull shed that doesn’t come off with gentle rolling — that risks tearing skin. If the retained shed has been on the digit for more than a day or two and the toe tip looks dark, pinched, or necrotic, go to a reptile vet. Tissue that has been circulation-compromised may require professional removal to prevent infection.
How soon after pickup should a leopard gecko eat?
Don’t try to feed for 48–72 hours after arrival. Let the gecko settle in and find its warm side before you introduce any additional stress. After 72 hours, offer 2–3 appropriately-sized feeders and observe whether it eats. Refusal to eat in the first week is normal and expected — transport and enclosure change suppress appetite. If the gecko hasn’t eaten at all after two weeks, reassess temperatures, hide placement, and feeder size, and consider a vet visit if the gecko is also showing signs of weight loss.
Can leopard geckos be cohabited?
No. Leopard geckos are solitary. Housing them together causes chronic stress, resource competition, and physical injury — dominant animals suppress subordinates’ feeding and basking access in ways that aren’t always visually obvious. If a seller is currently housing multiple leos together, that’s a red flag for their overall understanding of the species. The animals you’re evaluating may have been living under continuous stress, which suppresses immune function and masks other health issues.
Ready to Find the Right Leo?
Whether you’re buying from a private keeper or looking to adopt, you now have the inspection framework to make an informed decision on someone’s doorstep. If you’d like to skip the uncertainty and adopt a gecko that’s been fully assessed by people who’ve been keeping leos for years, check our current adoptables.