Which Nuts Are Toxic to Dogs? Almonds, Macadamias & Walnuts Compared
Macadamias are truly toxic, moldy walnuts cause tremors, almonds are merely a bad idea: the species changes everything.
Short answer: macadamias are genuinely toxic, moldy or black walnuts can cause tremors, and almonds are merely a bad idea. "Nuts" is not one answer: the species changes everything, and so does the trail mix around them.
The nut danger ranking
| Nut | Verdict | The actual risk |
|---|---|---|
| Macadamia | Toxic: 5/10 | True toxin: hind-leg weakness, tremors, fever from small amounts |
| Walnut (black/moldy) | Toxic: 5/10 | Tremorgenic mycotoxins; old yard walnuts are the classic case |
| Pecan | Caution: 4/10 | Fat, juglone, and mold risk off the ground |
| Almond | Caution: 3/10 | Not toxic, hard to digest, choking risk whole |
| Pistachio | Caution: 3/10 | Fat and salt; shells block guts |
| Cashew | Caution: 2/10 | One of the safer nuts in small plain amounts |
| Peanut (technically a legume) | Generally fine | Plain and unsalted, in moderation |
Macadamias: the one with a real toxin
Macadamia poisoning is distinctive: within about twelve hours dogs develop weakness that shows most in the hind legs, sometimes with tremors, vomiting and a mild fever. Even a few nuts can do it for a small dog. Most dogs recover within a day or two with veterinary support, but it always warrants a call.
The trail mix multiplier
Real-world nut ingestions are rarely one species. Trail mix and baking stashes combine macadamias with raisins and chocolate: three unrelated toxins in one raid. If your dog got into a mix, identify every ingredient before deciding anything is low-risk.
Bottom line
Available 24/7. A consultation fee may apply.