By Dial A Vet Veterinary Team
If your dog has just eaten an apple core off the lawn, you may have read online that apple seeds contain cyanide and started to panic. Take a breath. Apple seeds do contain a compound that can release cyanide, but the amount in a few seeds is very small, and most seeds are swallowed whole and pass through intact. For most dogs, the core itself is the more realistic problem, especially for small dogs that gulp.
Key takeaways
- Apple seeds contain amygdalin, which can release cyanide when seeds are crushed or chewed.
- A dog that eats one apple core is very unlikely to develop cyanide poisoning.
- Repeated large amounts of crushed seeds, such as from apple pulp or a pile of cores, are a different matter.
- Whole cores can cause choking or a blockage, particularly in small dogs.
- Related: apples for dogs, cherry pits, choking in dogs.
What is in an apple seed
Apples belong to the rose family, like pears, cherries and stone fruit. Their seeds contain amygdalin, a cyanogenic glycoside. When a seed is crushed and its contents mix with enzymes and water, hydrogen cyanide can be released. Cyanide stops cells using oxygen, which is why poisoning causes breathing difficulty and collapse.
The amount matters. An apple has only a handful of seeds, each with a hard coat that often passes through the gut undamaged. Cyanide poisoning from apple seeds in pets is rarely reported. The warning is worth knowing, but it should not cause alarm after a single core.
When apple seeds could be a concern
- A small dog that ate many cores at once, for example from under a backyard tree in autumn
- Dogs fed apple pulp or juicing waste, where seeds have been crushed
- Repeated daily access to cores over a long period
- Dogs that also chew apple tree leaves, stems or prunings
Fallen apples that have started to ferment or go mouldy can also cause vomiting, diarrhoea and, rarely, more serious signs from moulds.
The core is often the bigger issue
Apple cores are firm and woody. Small dogs, and greedy dogs of any size, may swallow a core whole. It can lodge in the throat or, less often, cause a blockage in the stomach or intestine. Large amounts of fruit also cause soft stools and wind.
Signs to watch for
Choking or blockage:
- Gagging, retching or pawing at the mouth
- Repeated vomiting or vomiting water
- Not eating, belly pain, lethargy
Possible cyanide toxicity (rare, usually develops quickly):
- Bright red gums
- Rapid or laboured breathing, panting
- Dilated pupils
- Trembling, weakness, collapse or seizures
Simple fruit upset:
- Soft stools or diarrhoea
- Mild tummy rumbles or wind
When it is an emergency
Go to a vet straight away if your dog is choking, struggling to breathe, has bright red or pale gums, is trembling, collapses or has a seizure. See a vet the same day for repeated vomiting, belly pain or refusal to eat after access to apples. If you are unsure whether the amount eaten is a concern, call your vet or the Animal Poisons Helpline on 1300 869 738. Do not try to make your dog vomit at home.
How vets assess it
Your vet will ask how many cores or how much fruit your dog may have eaten, and examine your dog. Most dogs that ate a core or two need no treatment beyond monitoring. If a large amount was eaten recently, your vet may decide to induce vomiting in clinic. X-rays help if a blockage is suspected. Suspected cyanide poisoning is managed in hospital with oxygen and supportive care.
How to share apple safely
Apple flesh is a good low-fat treat for many dogs. To share it:
- Wash the apple and cut slices away from the core
- Remove seeds and stem
- Offer thin slices or small cubes, especially for small dogs
- Keep it to a few pieces, as part of the daily treat allowance
- Skip apple pie, toffee apples and apple juice, which add sugar, fat and sometimes spices
Prevention tips
- Pick up windfall apples regularly in autumn.
- Put cores into a lidded bin rather than tossing them in the garden.
- Ask children not to share half-eaten apples with the dog.
FAQ
My dog ate a whole apple core. Do I need to go to the vet?
Usually not for the seeds. Watch for choking, vomiting or appetite loss, and call your vet if your dog is small or you notice any signs.
How many apple seeds are dangerous?
There is no single number. Risk depends on how many seeds were chewed and crushed, the size of your dog and how often it happens. A few seeds in one core are very unlikely to be harmful.
Are apple leaves toxic?
Leaves and stems also contain cyanogenic compounds, especially when wilted. Keep prunings out of reach.
Can dogs eat dried apple?
Plain dried apple is sugary and chewy. Small amounts are generally tolerated, but avoid products with added sugar or preservatives.
Talk with a vet
If your dog has been raiding the apple tree or the fruit bowl and you are not sure whether to worry, a Dial A Vet veterinarian can help you assess the risk. Book a Dial A Vet consult.
References
- Merck Veterinary Manual. Cyanide poisoning in animals.
- Merck Veterinary Manual. Cyanogenic glycoside-containing plants of veterinary importance.
- ASPCA Animal Poison Control Center. Apple (Malus sylvestris) toxic plant listing.
- RSPCA Australia Knowledgebase. What should I feed my dog?
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If you are worried about your pet right now, contact your local vet or nearest emergency animal hospital.