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

My 15 kg dog ate two old, mouldy pear cores left on the counter overnight. Is this an emergency?

Dogs · Emergency guide

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

Short answer

Yes, call your vet or the ASPCA poison line (888-426-4435) now. The mould adds a separate toxin risk, and crushed pits release cyanide. A dog that size eating two whole cores is a real concern — watch for bright red gums or laboured breathing. Do not try to make him vomit. Grab the remaining cores or any mouldy bits in a bag to show the vet. They may need to give oxygen and an antidote.

Why Are Pear Pits Toxic to Pets?

Pear pits, seeds, and stems contain amygdalin, a cyanogenic glycoside.

When chewed or digested, amygdalin is converted to hydrogen cyanide, which interferes with cellular oxygen use.

The flesh of the pear is generally safe, but the core and seeds pose the main risk.

Ingestion of a few seeds is unlikely to cause poisoning, but a large amount of crushed pits can be dangerous.

Why speed matters

Delaying care significantly worsens outcomes. Some signs appear hours or days later, so "looks fine right now" is not a reason to wait.

Signs to watch for

  • Dilated pupils
  • Bright red gums and mucous membranes
  • Difficulty breathing or panting
  • Shock and collapse
  • Vomiting and abdominal pain

What to do right now

  1. Call your veterinarian or a pet poison helpline immediately.
  2. Do NOT induce vomiting unless specifically instructed by a professional.
  3. If possible, note how many pits or seeds were ingested and if they were crushed.
  4. Bring any remaining plant material or packaging with you to the veterinary clinic.
  5. Be prepared for the vet to administer an antidote and provide oxygen therapy.
If your pet shows any of the signs above, go to the nearest emergency vet now and call ahead.

The step-by-step response, from the first minute to the vet visit, is in our Pear Pits and Seeds Poisoning in Dogs and Cats emergency guide.

Open the full emergency guide: Pear Pits and Seeds Poisoning in Dogs and Cats →