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My 12 kg dog ate a few bites of cooked celeriac that was left out overnight and now has mold on it — is that safe?

Dogs · Food safety

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

No, moldy celeriac is not safe. Mold can produce toxins that cause vomiting, tremors, or even seizures in dogs, regardless of the vegetable underneath. Watch for drooling, stomach cramps, or any unusual wobbliness in the next few hours. Offer plenty of fresh water to help flush it through. If you see those signs, call your vet — they may want to induce vomiting if it was very recent. For future scraps, store cooked veggies in the fridge right away.

How mold turns cooked celeriac dangerous

That overnight sit allowed invisible mold spores to colonize the celeriac's surface and produce mycotoxins—compounds that survive cooking temperatures. A 12 kg dog eating several bites may ingest enough to trigger neurological symptoms, unlike simple food poisoning. The first signs often appear as exaggerated swallowing motions or sudden sensitivity to light and sound.

Mold toxins don't always cause immediate vomiting—some take hours to absorb into the bloodstream. What looks like 'just a few bites' could contain concentrated patches of mold growth underneath. Check the remaining celeriac for fuzzy spots in colors beyond typical white—blue, black, or deep green indicate higher-risk mold species.

Why size matters with mycotoxin exposure

At 12 kg, your dog isn't in the most vulnerable weight category (under 5 kg), but still lacks the body mass to dilute toxins effectively. The cooked vegetable base means faster absorption than if it were raw fiber. Watch for muscle tremors starting in the face—twitching whiskers or lip quivering often appear before full-body shaking.

Unlike bacterial food poisoning that mainly causes gastrointestinal signs, mold toxins frequently affect coordination first. Your dog might misjudge jumps or bump into walls. These neurological changes can progress rapidly—note the exact time you first observe any clumsiness, as this timeline helps veterinarians gauge severity.

The critical window for mold toxin reactions

Most mold-related symptoms manifest within 4-12 hours post-ingestion. For a dog that ate this around mealtime, bedtime could coincide with peak toxin activity. Set up a comfortable resting area where you can observe them through the night—use your phone's flashlight periodically to check pupil size (unequal or extremely dilated pupils are red flags).

Hydration supports toxin clearance, but don't force water if they're nauseated. Offering ice chips or wetting their gums with a soaked cloth helps prevent dehydration without triggering vomiting. The mycotoxins affecting dogs often bypass the liver's filtration system, so symptoms may persist longer than typical foodborne illness.

When wobbliness means emergency care

Any seizure-like activity—even brief 'spacing out' episodes where your dog seems unresponsive—requires immediate veterinary attention. At 12 kg, their metabolism can't quickly break down certain mold compounds that attack the nervous system. Time matters more than with typical dietary indiscretion.

Less dramatic but equally urgent are temperature regulation issues. Mold toxins sometimes disrupt the body's thermostat—feel your dog's ears and paws. If they're unusually hot or cold compared to normal, this indicates systemic involvement. Don't wait for vomiting or diarrhea to appear; neurological signs alone justify an ER visit.

The full verdict, portion guidance and serving notes are collected on the Celeriac food facts page.

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