Suspect poisoning? US: ASPCA Poison Control (888) 426-4435 · UK: 01202 509 000 · Severe symptoms → nearest emergency vet now.

My 8 kg terrier licked a single grain of slug bait off the patio an hour ago — is that an emergency?

Dogs · Toxicity calculator

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

Short answer

Yes, treat this as an emergency and call your vet or the ASPCA poison line at 888-426-4435 immediately. Metaldehyde is highly toxic and even a tiny amount can cause severe tremors and seizures, which may start within hours. Do not wait for symptoms to appear, as by then it's much harder to treat. Keep your dog calm and cool, and bring the bait packaging with you to the vet so they know the exact concentration they're dealing with.

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 →