Can Dogs Eat Walnuts?
It is best to keep walnuts away from your dog. While a single, fresh walnut is unlikely to cause serious harm, these nuts pose several risks that make them a poor choice for a canine snack. The primary concerns are their high fat content and the potential for toxic mold growth, which can have serious effects.
This is true for all types of walnuts, but especially for black walnuts, which should always be avoided. Safer, more suitable treats are a better option for your pet.
Walnuts and dogs: the facts in one table
| Verdict | Better avoided |
|---|---|
| What to do |
|
| Remove or avoid |
|
| Main risks |
|
| Signs to watch |
|
What makes walnuts risky for dogs
Walnuts contain a high concentration of fats and oils. For a dog, consuming fatty foods can lead to digestive problems. You might see signs like vomiting, diarrhea, or a sore belly after your dog eats too many. In some dogs, even a single high-fat meal can contribute to pancreatitis, a painful inflammation of the pancreas.
A more immediate danger comes from mold. Walnuts, particularly those that are old or have fallen from a tree, can develop mold. This mold can produce mycotoxins, which are toxic substances that affect a dog’s nervous system. Ingesting these toxins can lead to serious symptoms like tremors and even seizures.
How to handle walnuts and what to avoid
Given the risks, there is no recommended way to offer walnuts to a dog. The safest approach is to choose a different, dog-appropriate treat instead. Always supervise your dog, especially outdoors where they might find walnuts on the ground.
You should make sure your dog cannot access any of the following:
- All walnuts: This includes English walnuts and especially black walnuts. Keep them securely stored and out of your dog’s reach.
- Old or moldy walnuts: Be particularly careful with walnuts that have been sitting out or have fallen from trees, as these are most likely to carry harmful mold.
- Walnut baked goods: Desserts like walnut brownies or breads often contain other ingredients that are unsafe for dogs, in addition to the risks from the nuts themselves. Always read ingredient labels before sharing any human food.
When to skip walnuts altogether
Walnuts should be completely avoided for all dogs. The combination of high fat content and the risk of mycotoxins from mold makes them an unsuitable and potentially dangerous food. This is particularly true for dogs with a history of digestive sensitivity or pancreatitis, as the high fat can easily trigger a flare-up.
If you are looking for a crunchy treat for your dog, it is much safer to stick with snacks specifically formulated for canines or to ask your veterinarian for a list of approved fruits and vegetables. Keeping walnuts off the menu helps ensure your dog stays safe and healthy.
When to call your vet
Most dogs who eat a little plain walnuts need nothing more than watching. Call your vet if anything below shows up, or if your dog has a health condition or is on a special diet.
If your dog eats walnuts, contact your veterinarian or a pet poison hotline for guidance. Note how many were eaten, when it happened, and if they were possibly moldy. If you see signs like vomiting, tremors, or seizures, seek immediate veterinary care.
Emergency signs: go now
- Collapse, fainting or severe weakness
- Seizures, tremors or trouble standing
- Trouble breathing or blue, gray or very pale gums
- Repeated vomiting or retching, or a swollen, painful belly
- Any known contact with a substance listed as toxic, even before signs appear
Book an appointment soon
- Vomiting or diarrhea that lasts or keeps coming back
- Not eating or drinking, or drinking much more than usual
- Drooling, pawing at the mouth or a swollen face
- Lethargy, hiding or acting unlike themselves
ASPCA Animal Poison Control Center: (888) 426-4435 (a consultation fee may apply). Your own vet or nearest emergency clinic is always a good first call.
Sources
- ASPCA Animal Poison Control Center: People Foods to Avoid Feeding Your Pets
- American Kennel Club: Can Dogs Eat Walnuts?
Last checked October 21, 2026. Listings and guidance can change; your veterinarian knows your pet’s health history.