🚨 If symptoms are present — go to emergency vet NOW. ASPCA Poison Control: (888) 426-4435 (24/7)
Compost Poisoning in Dogs
Compost heaps and garbage containing moldy food are extremely dangerous for dogs. Molds that grow on decaying organic matter produce tremorgenic mycotoxins (particularly penitrem A and roquefortine C) that cause violent muscle tremors and seizures — symptoms that can appear within 30 minutes and can be fatal without treatment. Dogs are strongly attracted to the smell of compost and moldy food, making this a particularly common and deadly poisoning.
Sign in to log this event to your dog's health record.
A $95 consultation fee applies to ASPCA Poison Control calls.
⚡ Immediate Actions
- 1This is an emergency — call your vet or emergency clinic immediately.
- 2Call ASPCA Poison Control (888) 426-4435 while driving to the vet.
- 3Do not induce vomiting if the dog is already trembling or seizing — aspiration risk is high.
- 4Keep the dog cool — hyperthermia from tremors can cause brain damage.
- 5Note what the dog got into and bring a sample if safely possible.
Symptoms & Timeline
Rapid onset (within 30–60 minutes)
Penitrem A and roquefortine C block inhibitory glycine receptors and modulate GABA-A receptor function in the spinal cord and brainstem, removing the normal inhibitory tone on alpha motor neurons. With inhibition removed, motor neurons fire continuously and uncontrollably — producing the characteristic sustained tremors. Simultaneous autonomous muscle contractions generate massive heat output without the normal thermoregulatory response, driving core temperature rapidly upward.
- Muscle tremors (mild to violent full-body shaking)
- Incoordination and staggering
- Vomiting
- Panting and drooling
- Elevated body temperature (hyperthermia from muscle activity)
Severe
As motor neuron disinhibition spreads to cortical circuits, tonic-clonic seizures begin. Status epilepticus (continuous seizure activity) compounds hyperthermia, driving temperatures that cause direct neuronal death above 108°F. Respiratory muscle fatigue and aspiration of secretions create the conditions for respiratory failure and death in untreated cases.
- Grand mal seizures
- Collapse
- Respiratory failure (if sustained seizure activity)
- Death without treatment
How Compost, Moldy Food, Garbage — Tremorgenic Mycotoxins Affects Dogs
Tremorgenic mycotoxins — primarily penitrem A (produced by Penicillium crustosum) and roquefortine C (found in some blue cheeses and moldy foods) — act on GABA-A receptors and glycine receptors in the CNS, causing disinhibition of motor neurons. This produces characteristic sustained muscle tremors and seizures. The toxins can be present in any decomposing food, particularly bread, dairy, pasta, nuts, and garden waste. Penitrem A is heat-stable, meaning cooked or baked moldy food is still dangerous.
What Your Vet Will Do at the Clinic
Compost poisoning is a neurological emergency requiring simultaneous tremor control, seizure management, and temperature regulation — all of which exacerbate each other if not addressed together. Methocarbamol, a centrally acting muscle relaxant, is the primary drug for tremor control; it works by depressing polysynaptic nerve transmission in the spinal cord and brainstem, directly counteracting the glycine/GABA-A disinhibition. Diazepam or phenobarbital is layered on for seizure control by enhancing GABAergic inhibition — restoring some of the inhibitory tone the mycotoxin removed. Aggressive active cooling runs simultaneously: the tremors and seizures are generating massive heat, and without cooling, hyperthermia will cause brain damage regardless of how well the tremors are controlled pharmacologically. IV fluids maintain blood pressure and renal perfusion, which is critical since myoglobin released from damaged tremoring muscle can cause acute tubular necrosis. Dogs treated early with this protocol typically recover within 24–48 hours.
Step-by-step protocol:
- 1Induced emesis only if very recent ingestion (< 30 min) and dog is NOT yet tremoring
- 2Activated charcoal to reduce further toxin absorption
- 3Methocarbamol (muscle relaxant) to control tremors — mainstay of treatment
- 4Diazepam or phenobarbital for seizure control
- 5Aggressive IV fluid support
- 6Active cooling measures for hyperthermia
- 7Continuous monitoring in ICU setting — toxins can recirculate
- 8Recovery typically 24–48 hours with aggressive treatment; prognosis good if treated early
Frequently Asked Questions
How quickly do symptoms appear after a dog eats compost?
Symptoms of tremorgenic mycotoxin poisoning can appear within 30 minutes to 2 hours of ingestion. The onset can be dramatic and rapid. Do not wait to see if symptoms develop — if you know or suspect your dog accessed a compost heap or moldy food, call your vet immediately.
Can my dog get mycotoxin poisoning from moldy cheese?
Yes. Roquefortine C, found in blue mold cheeses (Roquefort, Gorgonzola, etc.) and also produced by various Penicillium molds, is a tremorgenic mycotoxin. Dogs have developed serious tremors after eating small amounts of moldy cheese. Any significantly moldy food should be kept out of reach.
My dog ate something from the trash. When should I be worried?
The concern depends on what was in the trash. If the trash contained moldy bread, old pasta, moldy dairy, nuts, or any visibly spoiled food, watch very closely for tremors starting within 30–60 minutes and call your vet or ASPCA Poison Control immediately. Non-moldy food garbage poses different risks (obstruction, pancreatitis) but not tremorgenic toxicity.
🛡️ Emergency vet bills average $1,500–$5,000
Most US dog owners pay out of pocket. Pet insurance can cover 70–90% of unexpected emergency costs.
Sponsored · EverDogParent earns a referral fee if you purchase a plan
🐾
Log what happened — keep a record for your vet
Free health journal: note symptoms, timing, and vet advice. Searchable history for future reference.
Create free account →No credit card required · Works in your browser