Apple

Apple trees (Malus sylvestris) are potentially toxic to cats. The fruit flesh poses minimal risk, but the seeds, leaves, and stems contain cyanogenic glycosides (amygdalin) that can release cyanide when ingested — making those plant parts genuinely dangerous.

Signs of apple toxicity in cats include dilated pupils, rapid or labored breathing, hyperventilation, brick-red gums, drooling, vomiting, and weakness. Severe cases can progress to shock and collapse, though mild oral irritation is more likely after a small nibble of foliage.

Remove any remaining plant material from your cat's reach immediately, then call your vet or ASPCA Animal Poison Control at (888) 426-4435. Do not induce vomiting unless a veterinary professional directs you to. Even if your cat seems fine, call for guidance if it chewed leaves, stems, or whole seeds — especially from a wilting branch.

Exact onset timing in cats is not well documented by ASPCA, but cyanide is fast-acting in mammals once released — signs are likely to develop within minutes to a couple of hours of ingestion. Call your vet immediately at the first sign of breathing changes, red or bluish gums, or panting rather than waiting to see how symptoms progress.

Yes — apple seeds contain amygdalin, a cyanide precursor that becomes dangerous when chewed and crushed. A dog that swallows a few whole, intact seeds is usually fine, but a dog that crunches a mouthful of seeds or strips wilting leaves and stems is at real risk. The fruit flesh itself is not toxic.

Early signs are drooling and vomiting. As cyanide is absorbed, more serious signs can follow: brick-red mucous membranes, dilated pupils, panting, labored breathing, and shock. Neurological signs are also possible in severe cases.

Remove your dog from the plant immediately. Do not give home antidotes and do not induce vomiting unless directed by a professional. Call ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661 right away — especially before symptoms appear if your dog is small or chewed a significant amount of seeds.

Once seeds are crushed and cyanide is released it can act rapidly, but ASPCA does not publish dog-specific time-to-onset numbers for apple ingestion. Because the timeline is unpredictable, call poison control immediately rather than waiting to see whether symptoms develop — do not wait for panting, labored breathing, or gum color changes before acting.