Why apple seeds are dangerous
Apple seeds contain amygdalin, a compound that breaks down into hydrogen cyanide when chewed.
Cyanide blocks the cells’ ability to use oxygen, leading to rapid organ failure.
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
- Repeated vomiting within 30‑60 minutes after eating the seeds
- Rapid breathing and panting appearing within an hour
- Weakness and stumbling by the afternoon
- Bright red or pink gums within 2‑3 hours
- Seizures or uncontrolled shaking in the evening
- Collapse or unconsciousness if untreated
What to do right now
- Call your vet or the Pet Poison Helpline right away
- Bring a sample of the seeds or the apple piece if possible
- Keep your pet calm and monitor breathing
- Do not induce vomiting because the cyanide can be absorbed quickly
- If breathing stops, begin CPR and transport to an emergency clinic
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 Apple Seed Poisoning in Dogs and Cats emergency guide.