Some wild mushrooms are highly toxic and can cause fatal liver or kidney failure.
Without expert identification, assume any mushroom your dog finds outdoors could be deadly.
Several wild species — particularly Amanita phalloides (death cap), Galerina marginata and Lepiota brunneoincarnata — contain amatoxins that destroy hepatocytes. Symptoms often pause for 24–48 hours after initial GI signs, falsely suggesting recovery, before fulminant liver failure develops. Other species (Inocybe, Clitocybe) cause neurological signs; some Cortinarius cause kidney failure.
Sources
Treat any wild-mushroom ingestion as an emergency. Bring a sample of the mushroom to the vet if possible. The lethal dose of amatoxin is approximately 0.1 mg/kg.
Contact your veterinarian or an emergency animal poison hotline immediately. Do not induce vomiting unless instructed by a vet.
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