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My 12 kg pregnant dog ate three blue slug bait pellets from the garden bed — is metaldehyde toxic to her unborn puppies?

Dogs · Toxicity calculator

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

Short answer

Yes, it's toxic to her and risks the litter. Metaldehyde causes severe tremors and seizures, and the violent muscle contractions can trigger premature labor or harm the puppies. Signs like drooling and wobbliness can start within 30 minutes. Call your vet immediately — do not wait. Keep her cool and calm; wrap her in a towel if she starts shaking to prevent injury. Bring the bait package to confirm the metaldehyde percentage. Do not try to make her vomit if she shows any twitching.

Why does metaldehyde poison so quickly?

Metaldehyde is absorbed rapidly from the stomach and hits the central nervous system, causing severe tremors and seizures that can begin within 30 minutes to 3 hours. It can also raise body temperature dangerously high.

About the dose levels
Signs are possible from roughly 10 mg/kg of metaldehyde; severe seizures above ~30 mg/kg. Pellets vary between 2% and 6%.

Signs to watch for

  • Vomiting, drooling, excessive panting
  • Muscle tremors, twitching of the face
  • Incoordination, appearing "drunk"
  • Seizures, very high body temperature
  • Collapse and breathing failure in severe cases

What to do right now

  1. Call your vet now — seizures can start quickly and are hard to control at home.
  2. Do not try to make the dog vomit if it is already twitching or seizing.
  3. Bring the bait packaging to confirm the metaldehyde percentage.
  4. Keep the dog cool and calm on the way to the vet.
If your pet shows any of the signs above, go to the nearest emergency vet now and call ahead.

For a dose worked out against your pet's weight, use the Slug Bait (Metaldehyde) Toxicity Calculator.

Open the full calculator: Slug Bait (Metaldehyde) Toxicity Calculator →