Can dogs eat walnuts?
If your dog has just eaten walnuts
Do this now
- One or two fresh plain walnuts usually cause only mild stomach upset
- A larger amount, or any tremors, weakness, or unsteadiness, warrants a vet call
- Moldy walnuts (found outdoors) are more serious — call the ASPCA Animal Poison Control Center on (888) 426-4435
What your vet will want to know
Have this information ready when you call:
- Your dog's current weight
- Approximately when the incident happened
- How much your dog ate (a rough estimate is fine)
- Any symptoms you've already noticed (vomiting, weakness, drooling, etc.)
- Any medications your dog is currently on
The full picture
Walnuts are problematic for multiple reasons. They're high in fat (pancreatitis risk), hard to digest, a choking hazard, and — crucially — they often harbour a mold called Aspergillus that produces tremorgenic mycotoxins. These can cause tremors and seizures within hours of eating moldy walnuts. Black walnuts are considered particularly toxic, but all walnuts carry some risk, especially if not fresh. Add the tough shells (which can cause internal damage or blockage) and the verdict is clear: avoid.
Only your vet should make this call. If you can't reach them, our 4-gate safety checker walks through when hydrogen peroxide is appropriate (and when it's dangerous — sharp objects, caustics, certain breeds, and more).
Check if vomiting is safe →Risks to watch for
- Tremors and seizures from mold mycotoxins
- Pancreatitis from fat
- Intestinal blockage from shells
- Choking hazard
Symptom timeline
Symptoms typically progress in stages. Knowing what to expect helps you act fast:
- 0–2 hours Early: vomiting, drooling if mold present; no symptoms if small amount of plain walnut
- 6–24 hours Black walnut or moldy: tremors, seizures, elevated body temperature
- 24–72 hours Pancreatitis signs (vomiting, lethargy, abdominal pain) from high fat content
Safe portion size
None recommended.
Safer alternatives
- Blueberries
- Plain xylitol-free peanut butter
- Carrot pieces
Common questions
My dog just ate walnuts — is it an emergency?
It depends on how much was eaten and your dog's size. Any amount of walnuts warrants a call to your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — don't wait for symptoms. Small dogs reach toxic thresholds on smaller amounts than large dogs, but individual sensitivity varies too.
How long until symptoms appear after eating walnuts?
Onset varies. Some toxicities (xylitol, caffeine) cause symptoms within 15–60 minutes. Others (onion, garlic, grapes) have delayed onset — symptoms may not appear for 24–72 hours, and clinical signs can still build days later. Always contact a vet immediately, even if your dog looks fine.
What's the treatment if my dog ate walnuts?
Treatment depends on the substance and the timing. Options can include induced vomiting (only within the first hour or so and only under vet instruction), activated charcoal to limit absorption, IV fluids to support the kidneys or liver, blood tests to monitor organ function, and specific medications for symptoms like tremors or seizures. Never attempt home treatment without vet guidance.
Are there any safe alternatives to walnuts?
See the alternatives section above. Most toxic human foods have perfectly good dog-safe alternatives — plain cooked meat, plain vegetables, or commercial dog treats designed for canine metabolism. There's no nutritional reason your dog needs human foods with known toxicity risks.
Unexpected vet bills can run into thousands
One emergency visit for food poisoning can cost $500–$10,000+. Compare US pet insurance in 60 seconds.
Learn about vet costs & insurance →Sources
The information on this page is compiled and cross-checked against these authoritative US veterinary and toxicology sources:
- ASPCA Animal Poison Control Center — 24/7 poison hotline and comprehensive toxic food database
- Pet Poison Helpline — veterinary toxicology service
- Merck Veterinary Manual — peer-reviewed clinical reference
- American Veterinary Medical Association (AVMA)
- American Kennel Club Expert Advice
- Cornell University College of Veterinary Medicine
Specific toxicity thresholds cited on this page come from the above sources; where they disagree, we cite the more conservative figure. Numbers are general guidance — individual dogs vary in sensitivity based on age, breed, medications, and health conditions. When in doubt, always call your vet.
Checked against US veterinary guidance — see our editorial standards and source list. If your dog has eaten something and you need urgent advice, call a vet or the ASPCA Animal Poison Control Center on (888) 426-4435.