Can dogs eat apple seeds?
No. apple seeds isn't safe for dogs and shouldn't be fed on purpose.
Why
Apple seeds contain cyanogenic compounds that release cyanide when digested. A seed or two is unlikely to cause harm, but multiple seeds or crushed seeds are dangerous.
What to watch for
Vomiting, diarrhea, difficulty breathing, lethargy, pale gums.
What to do
Call your vet if your pet has eaten multiple apple seeds or crushed seeds.
If they've already eaten some, don't wait for symptoms
This page is not veterinary advice and is not a diagnosis. It's a general reference for a common food, and it can't account for your pet's size, age, health conditions, medications, or how much they actually ate. Toxicity is almost always about dose. If your pet has eaten something you're worried about — or is showing any symptoms — call your veterinarian, an emergency animal hospital, or a poison control hotline right away. Never induce vomiting unless a veterinary professional tells you to.