Common Boa Constrictor Health Issues

Boa constrictors are hardy snakes when kept correctly, and most of what shows up on this list traces back to temperature, humidity, or the source you bought from.

Respiratory Infection

Wheezing, nasal discharge, and open-mouth breathing are the signs. The cause is temperatures or humidity running too low, or poor ventilation. It needs antibiotics from a vet, and a severe case can progress to septicemia, an emergency that needs intensive care.

A thermometer and hygrometer is the best tool for catching this early, since it confirms the enclosure is holding the temperature and humidity it needs. A thermostat, set up the way the reptile heating and thermostats guide describes, is what keeps that temperature stable overnight.

Scale Rot

Brown, yellow, red, or greenish-black discoloration on the belly scales, from substrate kept too wet or dirty. Left untreated it can become systemic and fatal, so discolored belly scales go to a vet. Keeping the substrate dry and clean is the prevention. A thorough enclosure cleaning belongs alongside the treatment, since the snake goes straight back onto the same bedding.

Mouth Rot (Infectious Stomatitis)

Swollen gums and visible pus in the mouth, usually tied to stress, poor husbandry, or an untreated injury. Severe cases need surgical cleaning as well as antibiotics, which is work for a vet with reptile experience.

Inclusion Body Disease (IBD)

IBD is caused by a reptarenavirus. Early signs are vague: loss of appetite, chronic regurgitation, weight loss, poor wound healing, bad sheds, and secondary infections. Later it becomes neurological, with head tremors, stargazing, a corkscrewing motion, and a snake that cannot right itself when rolled over. There is no cure.

The detail that shapes everything about prevention in this species: a boa can carry the virus for months to years with few or no signs. Pythons usually die within days or weeks of showing signs, but an infected boa can look healthy, be sold, and spread the virus through breeding, bites, contact with feces, and snake mites. Blood work can show inclusion bodies in white blood cells, and a definitive diagnosis takes PCR and a biopsy of internal tissue.

Buying a Boa: The IBD Prevention Plan

Since a carrier looks healthy, the purchase is the prevention. A breeder worth buying from:

• Has done this for years and puts animal health ahead of volume.
• Can show an IBD blood test for the animal or its parents on request, before money changes hands.
• Keeps records and hands them over: morph and genetics, sex, hatch date, prey type and size, last meal, last shed, temperament, and any past health problems.
• Sells captive-bred animals. Captive-bred boas tend to be healthier and calmer than imports or pet store animals, and poor hygiene in stores and careless facilities is one way IBD spreads.
• Is honest about the label. Pet stores sometimes sell cheaper common boas (Boa constrictor imperator) as "red-tails," the true Boa constrictor constrictor, so paying red-tail money calls for proof of lineage, not a name on a tag.

Check the snake as well before buying. Its eyes and nostrils should be clear, its breathing quiet, its body smooth and muscular with a firm grip, and its spine straight. The vent should be clean and sealed, with no lumps, scars, wounds, or mites.

Then quarantine. Keep the new boa alone in a bare enclosure on paper towels for at least 3 to 6 months, away from any other snake, and ask your own vet for an IBD blood test during that time. The reptile quarantine guide covers the separate tools and handling order that stop mites, one of the ways the virus moves between enclosures.

Internal and External Parasites

Weight loss and lethargy point to internal parasites; small, dark specks resembling tiny ticks point to mites. A vet diagnoses and treats both, and a routine fecal exam catches internal parasites before they become a bigger problem. Mites deserve extra urgency in a boa collection because they also carry IBD.

The Husbandry Pattern

Low temperature or humidity, or poor ventilation, causes respiratory infection. Wet, dirty substrate causes scale rot. Stress and poor husbandry contribute to mouth rot. And an untested, unquarantined new snake is how IBD and mites get into an otherwise healthy collection. The boa most likely to stay healthy is the one bought from a seller who can prove its history and then kept alone long enough to prove it again.

Sources & Further Reading