Wild mushrooms — Food safety facts
Do not feed · Dogs · full breakdown on the linked food page
Never feed wild mushrooms — several species cause liver failure or death. Even store mushrooms are best cooked.
Short answer
Yes, this is an emergency. Never feed wild mushrooms to dogs because several species cause liver failure or death. Even store-bought mushrooms are best served cooked, so do not offer any raw mushrooms. Call your vet or the ASPCA Poison Control line at 888-426-4435 right away.