Can dogs eat walnuts?
Not recommendedNo, dogs should not eat walnuts. Even plain English walnuts are high in fat and a choking risk, while black walnuts and any moldy walnuts are outright toxic and can cause seizures.
Reviewed by the Webvet Veterinarian Team · Last reviewed June 26, 2026
Can Dogs Eat Walnuts?
No, dogs should not eat walnuts. Even plain English walnuts are high in fat and a choking hazard, and the picture gets much worse with black walnuts and any nut that has started to grow mold, both of which are genuinely toxic to dogs and can cause tremors and seizures. Walnuts are one of those human snacks that seem harmless because they are healthy for people, but for a dog they offer no nutritional benefit and carry several overlapping risks that are simply not worth taking. If your dog swipes one plain nut off the floor it is usually not an emergency, but walnuts should never be an intentional treat.
- 1Walnuts are not recommended for dogs: high fat, choking risk, and no real nutritional upside.
- 2Black walnuts contain juglone and are considered toxic to dogs.
- 3Moldy walnuts carry tremorgenic mycotoxins that can cause muscle tremors and seizures.
- 4One plain English walnut rarely causes a crisis, but a black or moldy nut, or a large amount, warrants a call to your vet.
- 5Pet Poison Helpline: 855-764-7661. ASPCA Animal Poison Control: 888-426-4435.
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Are walnuts safe for dogs?
The honest answer is that walnuts sit in a gray zone that leans firmly toward avoid. A single plain, fresh English walnut is not classified as acutely poisonous the way grapes, raisins, or chocolate are, so a large dog who steals one from the counter will very likely be fine. That is different from saying walnuts are safe or good for dogs. When you look at the whole category, walnuts combine a set of hazards that most veterinary sources agree add up to a clear recommendation against feeding them. There is no vitamin, mineral, or fatty acid in a walnut that your dog cannot get more safely from its regular balanced diet or from a dog-appropriate snack.
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The reason walnuts get labeled not recommended rather than simply toxic is that the danger depends heavily on the type of walnut, its freshness, how much was eaten, and the size of the dog. A plain English walnut eaten by a Labrador is a very different situation from a black walnut, a handful of moldy nuts, or a single nut swallowed whole by a small terrier. Because a dog owner rarely knows exactly which type of walnut is involved or whether it has begun to grow mold, the safest policy is to treat all walnuts as off limits and keep them well out of reach.
Why walnuts are risky for dogs
The first problem is fat. Walnuts are roughly sixty-five percent fat by weight and pack around 654 calories per 100 grams, which makes them one of the richest common tree nuts. A sudden dose of that much fat can irritate a dog's stomach and cause vomiting and diarrhea, and in more sensitive dogs it can trigger pancreatitis, a painful and potentially serious inflammation of the pancreas. Breeds already prone to pancreatitis, along with overweight dogs and dogs with a history of digestive trouble, are especially vulnerable. Even when a nut is otherwise safe, the fat load alone is a good reason to skip it.
The second problem is toxins. Black walnuts contain a natural compound called juglone, which is toxic to many animals and is one reason black walnut trees are considered hazardous around horses and dogs. On top of that, walnuts of every variety are notorious for growing mold when they sit on the ground, get damp, or age in the pantry. That mold can produce tremorgenic mycotoxins, the same family of toxins that make moldy food and compost so dangerous to dogs. These mycotoxins act on the nervous system and can cause muscle tremors, incoordination, high body temperature, and seizures within hours of being eaten. A walnut that looks slightly discolored or has been sitting under a tree is a real neurological risk, not just an upset stomach.
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The third problem is physical. Whole walnuts are large and hard, and the shells are tough and jagged. A dog that gulps a whole nut or a piece of shell can choke, and smaller dogs can end up with a painful intestinal blockage that sometimes needs surgery to resolve. Even shelled walnut pieces can be a choking risk for tiny dogs that do not chew thoroughly. None of these hazards buys your dog anything in return, which is why nearly every veterinary source lands on the same conclusion.
English walnuts vs. black walnuts
Grocery stores usually sell English walnuts, the mild, light-colored nut you find in baking aisles and snack mixes. These are the less dangerous of the two, and a single plain one is unlikely to poison a healthy dog. Black walnuts are a different story. They come from a native North American tree, have a much harder shell and stronger flavor, and are widely reported to be toxic to dogs. Black walnut hulls and the nuts themselves are frequently linked to tremors and neurological signs, and the wood, leaves, and fallen nuts can all be a problem in yards where black walnut trees grow.
Here is the practical catch: once a walnut is out of its shell and mixed into trail mix, a salad, or a baked good, most people cannot reliably tell an English walnut from a black one, and they certainly cannot see whether invisible mold has started to grow inside. That uncertainty is exactly why the blanket advice is to keep all walnuts away from dogs rather than trying to judge which nut is the safe kind in the moment. If you have a black walnut tree in your yard, be especially vigilant during autumn when nuts drop and begin to rot, since those fallen, molding nuts are the most dangerous form of all.
| Form of walnut | Risk level for dogs |
|---|---|
| Plain fresh English walnut (small amount) | Low but not zero: mainly fat and choking |
| Whole in-shell walnut | Choking and intestinal blockage risk |
| Black walnut | Toxic: juglone, tremors, neurological signs |
| Moldy or fallen walnut | High: tremorgenic mycotoxins, seizures |
| Salted, candied, or chocolate-coated | High: added salt, sugar, xylitol, or chocolate |
What about walnuts in banana bread or baked goods?
Baked goods that contain walnuts, such as banana bread, brownies, carrot cake, and holiday cookies, are best kept away from dogs for reasons that go beyond the nuts themselves. The walnut pieces still bring their fat and mold risk, but the bigger concern is often what else is in the recipe. Chocolate, raisins, large amounts of butter and sugar, and the sugar substitute xylitol are all common baking ingredients that range from harmful to outright dangerous for dogs. Xylitol in particular can cause a rapid, life-threatening drop in blood sugar even in tiny amounts.
This means a slice of walnut banana bread is not just a walnut question, it is a whole-recipe question. If your dog eats a baked good that contains walnuts, check the ingredient list for chocolate, raisins, and xylitol first, because those may be far more urgent than the nuts. When in doubt, call your veterinarian or a poison control line and read them the ingredients so they can help you judge the real level of risk.
How many walnuts are dangerous?
There is no exact safe number, because the danger depends on the type of walnut, whether it is moldy, and the size of your dog. As a rough guide, one plain, fresh English walnut eaten by a medium or large dog is unlikely to cause more than mild stomach upset, if anything at all. The same nut swallowed whole by a very small dog can be a choking or blockage risk. A handful of walnuts, any black walnut, or any nut that might be moldy pushes the situation from minor to potentially serious. Because you often cannot be sure which scenario you are dealing with, it is safer to treat every walnut as something to keep away from your dog rather than trying to calculate a safe dose.
What to do if your dog ate walnuts
Start by figuring out what your dog actually ate. Try to identify whether it was a plain English walnut, a black walnut, a whole in-shell nut, or a moldy one, and estimate how many and how big your dog is. If it was a single plain English walnut and your dog is medium or large, you can usually monitor at home for vomiting, diarrhea, and lethargy over the next day and offer plenty of fresh water. Do not try to make your dog vomit unless a veterinarian tells you to.
Call your veterinarian or a poison control line right away if your dog is small, if a large amount was eaten, if the nut was a black walnut or looked moldy, or if the walnuts came in a baked good with chocolate, raisins, or xylitol. Seek emergency care immediately if you see muscle tremors, twitching, weakness, stumbling, a high temperature, or seizures, since these can signal mycotoxin or black walnut poisoning that needs urgent treatment. Acting early is always safer than waiting to see how bad it gets.
Safe alternatives to walnuts
If you want to give your dog a crunchy, satisfying snack without the risks of tree nuts, there are much better choices. Carrots are low in calories, high in fiber, and give the same satisfying crunch that makes nuts appealing, whether served raw in sticks or lightly steamed. Sliced apples with the core and seeds removed are another sweet, vitamin-rich option most dogs love. Both deliver real nutrition and a pleasant texture without the fat, mold risk, or choking hazard of walnuts, and they make far better everyday treats.
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If it is protein and healthy fat you are after, a little plain cooked chicken or a small piece of cooked egg is a safer, dog-friendly way to add richness to a treat. Whatever you choose, remember that treats of any kind should make up no more than about ten percent of your dog's daily calories, with the rest coming from a complete and balanced dog food.
Frequently asked questions
Frequently Asked Questions
Can dogs eat raw walnuts?
Raw walnuts are not recommended. Raw or roasted, an English walnut still carries a heavy fat load and choking risk, and raw nuts left in a bowl or on the ground are just as likely to grow the mold that produces dangerous mycotoxins. There is no version of raw walnut that makes a good dog treat.
Are black walnuts more dangerous than English walnuts?
Yes. Black walnuts contain juglone and are considered toxic to dogs, and they are frequently linked to tremors and other neurological signs. English walnuts are milder and less dangerous, but they are still high in fat and prone to mold, so neither type is safe to feed on purpose.
My dog ate one walnut. Should I panic?
Probably not, if it was a single plain English walnut and your dog is medium or large. Monitor for vomiting, diarrhea, and lethargy over the next day. Call your vet or a poison line if your dog is small, if the nut was black or moldy, if several were eaten, or if you notice any tremors or wobbliness.
What nuts can dogs eat safely?
Plain, unsalted peanuts and small amounts of xylitol-free peanut butter are the safest nut option, since peanuts are technically legumes rather than tree nuts. Cashews are lower risk in tiny amounts. Walnuts, pecans, and macadamia nuts should be avoided, with macadamia nuts being outright toxic to dogs.
Can dogs eat walnut banana bread?
It is best avoided. Beyond the walnuts, banana bread and similar baked goods often contain butter, sugar, and sometimes chocolate, raisins, or the sweetener xylitol, which can be far more dangerous to dogs than the nuts. If your dog eats some, check the recipe for those ingredients and call your vet if any are present.
Sources
Reviewed by the Webvet Veterinarian Team
General guidance based on credible veterinary sources — not a diagnosis or a substitute for your veterinarian. If your pet ate something toxic or is unwell, contact your vet or a pet poison line right away.