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Walnuts
Walnuts
Walnuts (Juglans spp.) are not directly toxic to cats in the same way as to dogs, but they present several health risks. The primary concern is juglone — a compound in black walnut that causes toxicity — and the risk of mould contamination with tremorgenic mycotoxins in any walnut that has been stored or is past its freshness.
Important Notes
Juglone risk (Black Walnut): juglone causes GI and neurological toxicity in cats; black walnuts are more dangerous than English walnuts
Mycotoxin risk: mouldy walnuts contain tremorgenic mycotoxins — causes severe tremors, seizures, and ataxia within hours
Physical hazard: walnut shells are hard and brittle; sharp fragments can injure the mouth and GI tract
High fat content: large amounts may trigger pancreatitis
If your cat ingests a mouldy walnut or shows tremors after contact with walnuts, seek veterinary care immediately
Potentially Toxic Parts
Skin
Entire food
Stem
Powder
Possible Symptoms Reported in Cats
Choking or Intestinal Obstruction
Gastrointestinal · Immediate (for choking) or progressive over hours to days (for intestinal blockage).
Pancreatitis
Gastrointestinal · 24 to 72 hours (or progressively over a few days).
If a cat ingests walnuts, the primary risks arise from the physical properties of the nut and its high fat and fiber content
Metabolic
Gastrointestinal Upset
Gastrointestinal · Within a few hours of ingestion.
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.