06/13/2026
Pet Safety Alert: Deadly Death Cap Mushrooms Linked to Local Dog Fatalities
We want to make all of our puppy and dog families aware of a serious danger currently affecting dogs throughout Northern California.
California health officials have issued warnings about an unusual and widespread outbreak of highly toxic Death Cap mushrooms (Amanita phalloides) and other poisonous mushrooms in multiple counties, including Marin, Napa, and Sonoma.
Death Cap mushrooms are among the most poisonous mushrooms in the world and are commonly found beneath oak trees, in parks, landscaped areas, gardens, and wooded spaces throughout our region.
We have recently learned of several suspected local dog exposures, including reported fatalities, while another dog required ten days of intensive veterinary care after ingesting a suspected Death Cap mushroom.
Even a small bite can cause severe liver failure and death.
One of the most dangerous aspects of Death Cap poisoning is that dogs may initially appear to recover after experiencing stomach upset, only to develop life-threatening liver damage hours or days later. Early treatment is critical and can dramatically improve the chances of survival.
Please be extra vigilant when walking your puppy or dog, visiting parks, hiking trails, or spending time in your yard - especially around oak trees, landscaped areas, and after rain or irrigation.
What To Do
• Keep dogs closely supervised outdoors
• Do not allow dogs to sniff, lick, or eat mushrooms of any kind
• Check your yard regularly and remove mushrooms immediately
• Keep dogs leashed in areas where mushrooms may be growing
• Contact a veterinarian or emergency animal hospital immediately if ingestion is suspected
Symptoms May Include
• Vomiting
• Diarrhea
• Excessive drooling
• Lethargy
• Loss of appetite
• Weakness or collapse
Treatment is most effective before symptoms develop. If you think your dog may have eaten a mushroom, do not wait for signs of illness to appear - seek veterinary care immediately.
Please share this alert with friends, neighbors, dog walkers, pet sitters, and fellow dog owners. A few moments of prevention could save a dog's life.
Stay safe,
Hillary's Hound House