Choosing a snake: the pre-purchase health check

Quick answer

Ten minutes with the animal in front of you decides most of what the next two years will be like.

Almost every problem that ruins a new snake's first year was visible, or askable, before money changed hands. Mites, a respiratory infection, retained shed, a spinal kink, a hatchling that has never eaten: all of these are findable in a few minutes if you know where to look.

The pre-purchase check has two halves. One is a head-to-tail examination of the animal. The other is a short list of questions that tell you more about the seller than about the snake.

• Ask to handle the animal before you decide. A seller who refuses is answering the question.
• Look at the vent, the chin and the seams between the ventral scales, not just the head.
• Feeding records matter more than appearance in a hatchling.
• Have the enclosure running and stable for several days before you buy, not after.
• Quarantine is not optional if you already keep reptiles.

Decide in 60 seconds

Why the animal in front of you tells you more than the label

Snakes are extremely good at looking fine. They are ambush predators with slow metabolisms, so a snake carrying a parasite burden, mild dehydration or a low-grade infection can sit in a display tub for weeks looking calm and normal.

That means you cannot use behaviour as your main filter. A snake sitting still is not necessarily healthy, and a snake that hisses and balls up is not necessarily unhealthy. Both are exactly what a snake does.

What does not lie is the body. Muscle tone, hydration, breathing effort, the state of the skin and the condition of the vent are physical findings, and none of them can be masked by a calm animal or a confident seller.

The other thing that does not lie is the record. A breeder who can tell you the hatch date, the sire and dam, every meal taken and refused, the last shed and the last defecation is a breeder who has been watching. A seller who cannot tell you when the animal last ate has told you what you needed to know.

The head-to-tail check

Ask to hold the snake. Support the body, do not restrain the head, and work in this order.

Clear spectacles, dry nostrils, and a tongue that flicks freely. The head takes ten seconds and rules out several of the worst problems.

Eyes.

Both spectacles should be clear and the same as each other. A uniform bluish haze across both eyes means the snake is in shed, which is normal and simply means come back in a week. One dull, wrinkled or opaque eye while the other is clear usually means a retained eye cap from a previous shed, which is a husbandry signal and sometimes a lasting problem.

Sunken eyes indicate dehydration.

Nostrils and breathing.

Nostrils should be clean and dry. Crusting, bubbles or any discharge is significant.

Watch the snake breathe with your hand off its body. Breathing should be silent and almost invisible. Clicking, whistling, wheezing, open-mouth breathing, or a head held persistently raised to draw air are all signs of respiratory infection, and in snakes that is rarely mild by the time it is audible.

Mouth.

If the seller is willing and the animal is calm, ask them to open the mouth briefly. You are looking for pink, even gum tissue with no pinpoint red spots, no swelling, no cheesy yellow material along the gum line, and no stringy mucus. Any of those suggest stomatitis, which needs veterinary treatment and often reflects long-standing poor conditions.

Do not force a snake's mouth open yourself in a shop.

Body condition.

Run the snake gently through your hands. In cross-section a healthy snake is rounded, or at most gently triangular with a soft ridge along the spine. A sharp, prominent spine with the ribs individually palpable is underweight. Loose folds and rolls of skin when the animal is stretched out are the opposite problem.

Muscle tone matters more than sheer bulk. A healthy snake grips, pushes and holds itself. One that hangs limply through your fingers is weak, and weakness in a snake is a late sign.

The spine and the neurology.

Run your fingers down the vertebral column feeling for kinks, steps or wobbles. Then watch the head. Corkscrewing, an inability to right itself when gently rolled, or a persistent head tremor are neurological signs. In some ball python morphs a characteristic head wobble is an inherited trait rather than an illness, but it is still a lifelong problem and it should be disclosed, not discovered by you.

Skin and scales.

Look for burn scars, especially on the belly, which point to an unregulated heat source in the animal's past. Look for pink, brown or blistered ventral scales, which indicate scale rot from damp, dirty conditions. Look for retained patches of old skin.

Mites.

Mites are the single most common thing that comes home with a new snake, and they hide. Check the heat pits along the lip if the species has them, the skin fold under the chin, the edges of the eyes, and the seams between the ventral scales. Look in the water bowl for small dark specks. Look at your own hands after handling.

Grey or white dusty residue on the animal, on the shed skin, or in the tub is mite waste. Constant soaking behaviour in the shop is a hint too, because a mite-infested snake tries to drown them.

Vent and tail.

The vent should be clean and closed, with no swelling, no smeared faeces and no protruding tissue. Check the tail for kinks and for the stub of a previously damaged tail.

The questions that reveal the seller

Ask these in this order, and listen for whether the answers are specific.

When did it hatch, and who bred it?

A specific date and a named breeder is a good sign. "Not sure, it came in a few weeks ago" means the animal is a resale of unknown history.

When did it last eat, what did it eat, and what size?

You want a date, a prey type and a prey size. For a hatchling, ask how many meals it has taken in total and how many it has refused. A snake with a run of accepted meals on frozen-thawed prey is a far easier animal than one that has eaten twice, both times live.

Has it eaten frozen-thawed?

This matters more than people expect. Converting a live-feeder to frozen-thawed is a project, and in many countries feeding live vertebrate prey is restricted or illegal. Ask directly.

When did it last shed, and did it come off whole?

A recent shed in one piece is a genuinely useful indicator of hydration and general condition.

When did it last defecate?

Long gaps in a snake that is eating are worth asking about.

Is it captive bred or imported?

Wild-caught and farmed imports arrive dehydrated, parasitised and stressed, and they are far more likely to refuse food for months. Signs at the point of sale include ticks wedged under scales, a worn or scarred rostrum from rubbing at enclosure walls, unusual nervousness, and mismatched shed quality. Some species are almost always captive bred; others are still imported in numbers. Ask, and be sceptical of a vague answer.

What morph is it, and what are the parents?

For ball pythons especially, some morph combinations carry known neurological defects and some pairings are lethal. A breeder who talks openly about genetics is a breeder who is thinking about the animal.

Can I see it eat, or see a photo of a recent meal?

Not always practical, but the reaction to the question is informative.

What to have running before you buy

The setup goes first. A snake collected before the enclosure is stable spends its first fortnight in the worst conditions it will ever experience.

The most common avoidable mistake is buying the snake and then assembling the enclosure around it.

Set the enclosure up and run it for several days before collection. You are not checking that the equipment switches on, you are checking that it holds a stable gradient across a full day and night cycle, including the coldest part of the night and the warmest part of the afternoon.

Verify temperatures with your own probe thermometer at the surface where the snake will actually lie, not with the number on the thermostat display and not with a stick-on dial.

Have two hides, one at each end, both tight enough that the snake touches the sides. Have a water bowl heavy enough that it cannot be tipped. Have a hygrometer if your species needs managed humidity.

If you already keep reptiles, have the quarantine enclosure ready too, in a separate room, on plain paper substrate, with its own tools and its own water bowl. Work with the new animal last, after every established animal, and wash between.

Red flags that mean walk away

Any breathing noise, bubbles, or open-mouth breathing. Respiratory infection in snakes is often chronic by the time it is obvious, and treatment is long.

Visible mites, or mite dirt in the tub. Not because the snake cannot be treated, but because you now have to treat a collection.

Cheesy material or pinpoint bleeding in the mouth. Stomatitis needs veterinary care and often reflects months of poor conditions.

A sunken, wrinkled, papery-skinned animal. Severe dehydration in a snake is a late finding.

Kinks, tremors or an inability to right itself. These do not resolve.

A shop that keeps snakes in unheated or overcrowded tubs, with no water, or with several species sharing. The animal in front of you may look fine and still be incubating what the tub next to it has.

A seller who will not let you handle the animal, or who has no answers about feeding.

Variation by species and by source

Ball pythons. Prone to feeding refusal, especially imported animals and animals moved to a new home in autumn and winter. The single most valuable thing you can buy is a solid feeding record on frozen-thawed prey. Morph genetics matter here more than in any other commonly kept snake.

Corn snakes and kingsnakes. Generally robust, generally good feeders, and usually captive bred. The main checks are body condition, mites and spinal kinks, which occur with some inbreeding.

Boas. Long-lived, heavy, and much stronger as adults than new keepers expect. Ask about the adult size of the parents, not the species average.

Hognose snakes. Reluctant feeders as hatchlings and often scented onto rodents. Ask specifically whether it is eating unscented rodents.

Large constrictors. Retics, Burmese and rock pythons are a different category of commitment involving weight, strength and, in many places, licensing. Two competent adults should be present when a large constrictor is handled, which is a rule of thumb widely used in the hobby. Check what your jurisdiction requires before, not after.

By source. A specialist breeder gives you records and genetics. A reptile expo gives you choice but no chance to see how the animal has been kept, and animals at expos have been transported and stressed. A general pet shop varies enormously. A private rehome can be excellent, and the questions become about why it is being rehomed and whether it is currently feeding.

By region. Legality differs sharply between countries and even between states or provinces: some species require licences, some are prohibited outright, and some are restricted for invasive-species reasons. Live prey feeding is restricted in some countries and normal in others. Import rules and CITES paperwork apply to several commonly traded species. Check your own jurisdiction before you commit, because an animal you cannot legally keep is not an animal you can easily rehome.

What never to do

Do not buy on the day you first look, if you can avoid it.

Go home, write down what you saw, and check the species' adult size, lifespan and requirements against your actual home. Impulse purchases at expos are the commonest route to a snake being rehomed within a year.

Do not skip quarantine because the animal looks healthy.

Incubation periods exist. A snake carrying a respiratory pathogen or a mite burden looks exactly like a snake that is not, for weeks.

Not this, not yet. A new snake should stay in a secure, simple enclosure for its quarantine period, not out in the house.

Do not handle the new snake for the first several days.

The single most common cause of a new snake refusing its first meal is being handled before it has settled. Leave it alone, let it find its hides, and offer food before you offer attention.

Do not choose a species by appearance alone.

Adult size, temperature and humidity needs, temperament, feeding difficulty and lifespan differ far more between snake species than their photographs suggest.

Do not accept "he'll eat once he settles" as a plan.

Sometimes true. Often the start of a months-long problem. If a hatchling has never eaten, treat that as the central fact about the purchase.

What the vet will ask for

Book a first appointment with an exotics or reptile vet within the first few weeks, before quarantine ends. Bring:

• The feeding record, including refusals
• The hatch date and origin, captive bred or imported
• A fresh faecal sample if the animal has passed one, kept cool and taken in promptly
• Your measured enclosure temperatures at both ends, plus the humidity if relevant
• Photographs of anything you noticed at the point of sale
• The shed skin if you have one

Expect a physical examination, a faecal check for parasites, and often a discussion of quarantine length. A new snake that is not eating will prompt questions about temperature, hides, disturbance and prey type before anything medical is considered, so bring numbers rather than impressions.

When to get help

Contact an exotics or reptile veterinarian promptly if a newly bought snake shows any of these:

• Any breathing noise, open-mouth breathing, or discharge from the nostrils or mouth
• Mites found after the animal is home, so the whole enclosure and any other reptiles can be dealt with together
• Refusal to eat beyond the first few weeks, especially with weight loss
• Regurgitation of a meal
• Any tremor, corkscrewing, or loss of the righting reflex
• Sunken eyes, wrinkled skin, or a snake that feels limp and toneless

Book a routine appointment regardless within the first month. A baseline examination and faecal check on a new snake is inexpensive compared with treating an established problem, and it gives your vet a healthy reference point for the animal, which is worth a great deal the first time something is genuinely wrong.