Aflatoxin Poisoning in Rabbits

Aflatoxin poisoning is a type of mycotoxin exposure. It happens when a rabbit eats food contaminated with toxins produced by certain molds, most often Aspergillus flavus or Aspergillus parasiticus. These toxins are especially associated with improperly stored grains, corn, peanuts, cottonseed, and other feed ingredients, but contamination can also affect mixed feeds and pellets. Once eaten, aflatoxins are processed in the liver, where they can damage liver cells and interfere with normal protein production.

In rabbits, this can lead to a range of problems from vague digestive upset and poor appetite to serious liver failure and abnormal bleeding. The exact signs depend on how much toxin was eaten, how long the exposure lasted, and the rabbit's overall health. Young, stressed, or already ill rabbits may have a harder time coping with toxin exposure.

Aflatoxin poisoning is not something pet parents can confirm at home. Mold is not always visible, and food can contain dangerous toxin levels even when it looks fairly normal. If you suspect exposure, save the food packaging and a sample of the feed or hay for your vet. That can help guide next steps and, in some cases, support laboratory testing of the suspected food source.

Aflatoxin poisoning is caused by eating contaminated feed or treats, not by the mold growing inside the rabbit. The toxins are made by certain Aspergillus molds before the food is eaten. Warm temperatures, humidity, drought stress in crops, insect damage, and poor storage conditions all increase the risk of contamination. Merck notes that aflatoxins are a worldwide feed problem and can develop both in the field and during storage.

Common risk items include pelleted feeds, grain mixes, seed-based treats, corn-containing products, peanuts, and other stored plant ingredients. Hay is usually less associated with aflatoxin than grain-based feeds, but any feedstuff that is damp, stale, or moldy should be treated as unsafe. Food does not need to look heavily moldy to be risky.

Rabbits may be exposed after eating old feed from a garage, shed, or humid storage area, or after a bag of pellets has been left open too long. Bulk bins and homemade feed mixes can also be harder to monitor. If one rabbit in the home is affected, your vet may recommend discarding the entire batch of suspect food rather than continuing to feed it to other pets.

Diagnosis starts with a careful history. Your vet will want to know what your rabbit ate, when signs started, whether the food smelled musty or looked abnormal, and whether other pets were exposed. Bring the original packaging if possible, plus a sample of the suspected pellets, treats, or feed in a sealed bag.

Your vet may recommend bloodwork to look for liver injury, dehydration, low protein, anemia, or clotting abnormalities. In toxin cases, chemistry testing can help show whether the liver is under stress, while a complete blood count may reveal inflammation or blood loss. Depending on the rabbit's condition, your vet may also suggest clotting tests, fecal testing to rule out other causes of diarrhea, and imaging such as radiographs or ultrasound to assess the abdomen and liver region.

A confirmed diagnosis can be difficult in living patients because signs overlap with other liver and digestive diseases. In some cases, diagnosis is based on a combination of compatible symptoms, abnormal lab results, known exposure, and improvement after the contaminated food is removed. Specialized testing of the feed for aflatoxin may help identify the source, especially if multiple animals were exposed.

Prevention starts with safe feed storage. Keep pellets, grains, and treats in a cool, dry place in sealed containers, and avoid buying more than you can use within a reasonable time. Heat and humidity raise the risk of mold growth and toxin formation. If food smells musty, looks dusty or clumped, feels damp, or has visible mold, do not feed it.

Check bags before purchase and again when you open them. Avoid feed that is old, damaged, or stored in garages, sheds, or other humid spaces. If your rabbit eats a pelleted diet, choose fresh product from a reliable source and rotate stock so older bags are used first. Grain-heavy mixes and seed treats can add storage risk, especially if they sit for long periods.

Do not try to sort out the visibly bad pieces and keep the rest. Aflatoxins can be present even when contamination is not obvious, and toxins may spread unevenly through a batch. If you suspect a problem, stop feeding the product, save a sample, and contact your vet. For households with multiple rabbits or other pets, replace the whole batch so no one else is exposed.