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Toxic to dogs. The ASPCA lists apple as toxic to dogs. Honestly calibrated: a couple of seeds from a single apple rarely produce cyanide signs, but bulk leaf, stem or seed eating is a genuine emergency with breathing signs on the list, so large or unknown amounts always earn an immediate call.
Almost every dog owner knows the apple question as a food question. The ASPCA's plant entry asks a different one: it lists the apple tree itself, Malus sylvestrus, including crabapples, as toxic to dogs, because of the cyanide chemistry in its seeds, stems and leaves. Backyard orchards, crabapple street trees and storm fallen branches are where dogs meet this listing in real life.
Apple and crabapple trees are small orchard and garden trees with oval toothed leaves, pink white spring blossom and round fruit from marble sized crabapples to full eating apples. The parts that matter for this page are easy to find: the dark seeds inside every core, the leafy stems, and above all fallen branches and pruned wood whose leaves are wilting, which is the state the ASPCA flags as particularly toxic.
The ASPCA names the toxic principle of apple as Cyanogenic glycosides. Apple seeds, stems and leaves carry cyanogenic glycosides: compounds that release cyanide when the tissue is chewed and digested. The ASPCA entry is specific about where the risk sits and when it peaks: stems, leaves and seeds contain cyanide, and wilting tissue is particularly toxic, because the wilting process frees the cyanide. The ripe flesh is not the problem part; the tree around the fruit is. This site's food guide covers apple flesh as a food on its own page; this page covers the tree.
The clinical signs the ASPCA lists for apple are: dilated pupils, brick red mucous membranes, panting, difficulty breathing and shock, driven by cyanide in the seeds, stems and leaves, with wilting foliage the most dangerous state. Cyanide signs are fast and distinctive when the dose is large: brick red gums, dilated pupils, panting and difficulty breathing, progressing to shock. That speed is why the call comes before the watching with this plant. The realistic dog scenarios are chewing pruned sticks with the leaves still on, grazing a wilted storm branch, and eating windfall crabapples whole, core and all, in quantity. One discarded core on a walk is the low end; a weekend of unsupervised access to a loaded crabapple tree is the end to act on. Our food guide covers whether dogs can eat apple flesh; this page is about the rest of the tree.
Most dangerous part: Wilted leaves and prunings, by volume, and chewed seeds in quantity. A storm broken branch wilting on the ground, or a pile of prunings, offers far more cyanogenic material than the few seeds in one eaten apple.
Call your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 right away, even if your dog looks fine. Some poisons take hours or days to show their worst effects. Do not make your dog vomit unless a veterinarian tells you to, and keep the packaging, a photo, or a sample of what was eaten to show the clinic.
Rake up storm fallen branches and prunings the day they come down, and never leave wilting apple wood where dogs can chew it as sticks. Pick up windfall fruit in season, especially small crabapples a dog can eat whole. Fence young orchard trees until the canopy and its drop zone sit beyond the dog's run.
There is no need to remove a healthy apple tree; manage the parts instead, with prompt pruning cleanup and windfall pickup. If you are planting new fruit for a dog household, banana is listed by the ASPCA as non-toxic and gives a very different, soft fruit harvest in warm zones or containers. Whatever you plant next, check it the same way this page was checked: confirm the plant on the ASPCA toxic and non-toxic list under its scientific name, Malus sylvestrus is the name to avoid here, before it goes in the ground or on the shelf.
Yes. The ASPCA lists apple (Malus sylvestrus) as toxic to dogs. Its toxic principle is Cyanogenic glycosides, and the signs it lists include dilated pupils, brick red mucous membranes, panting, difficulty breathing and shock, driven by cyanide in the seeds, stems and leaves, with wilting foliage the most dangerous state.
Call your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. Note what part of the plant was eaten and roughly how much, keep any remaining plant material to show the clinic, and do not make your dog vomit unless a veterinarian tells you to.
Wilted leaves and prunings, by volume, and chewed seeds in quantity. A storm broken branch wilting on the ground, or a pile of prunings, offers far more cyanogenic material than the few seeds in one eaten apple.
Apple flesh in moderation is a food question, and it is covered on this site's can dogs eat apples page. The toxic listing is for the seeds, stems and leaves, especially wilting leaves. Feed flesh without the core, and keep the tree parts out of reach.
The ASPCA entry includes crabapples in the same listing. The practical difference is size: small crabapples are eaten whole, core, seeds and all, and a dog can eat many in one session under a loaded tree, which is a much larger seed load than one shared eating apple.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. If your dog has eaten something toxic, contact your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. A consultation fee may apply on the helplines.
Last updated: November 2026. Every verdict on this page was checked against the sources listed above. How we work: our methodology.
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