Dog Ate Mushroom in Yard: What to Do Right Now

If your dog has eaten a mushroom from the yard, call your veterinarian, an emergency animal hospital, or an animal poison control centre immediately. The ASPCA's guidance is to seek advice from a vet or ASPCA Poison Control right away, because a delay in treatment can be dangerous with some mushrooms. The ASPCA Animal Poison Control Center number is (888) 426-4435, available 24 hours a day; a consultation fee applies.

While you are on the phone or on the way, do three things:

• Collect what is left. Take a whole specimen from the same patch, base included. The North American Mycological Association advises collecting samples in paper bags or waxed paper and refrigerating them until they can be examined. Do not seal them in plastic, which turns a mushroom to mush.
• Photograph the site. The cap from above, the gills underneath, the stem with its base, and what it was growing from — soil, a stump, buried wood, or mulch. Photograph it with the app and it identifies it; send your own photos to the vet as well.
• Note the time and the amount. How long ago, and roughly how much. Both change the treatment decision.

Do not induce vomiting unless a veterinarian or poison specialist tells you to. Timing, the dog's condition and the suspected species all change whether that is helpful or harmful.

The North American Mycological Association names the genera that concern veterinary toxicologists most:

• Amanita. Amanita phalloides is listed as deadly, and A. bisporigera and A. ocreata as amatoxin-containing. A. muscaria and A. pantherinoides can cause death in rare instances.
• Galerina, Conocybe and Lepiota. Also amatoxin-containing. Galerina fruits on buried wood in lawns, which puts it exactly where a dog digs.
• Inocybe and Clitocybe. Listed as lethal to dogs; Clitocybe species contain muscarine.
• Scleroderma, the earthballs, also listed as lethal to dogs.

The association also notes that dogs take a special interest in both Amanita phalloides and Inocybe species, quite possibly because of their fishy odour. That is an important detail for a yard: the species most likely to kill a dog is also one that attracts it.

Two patterns of illness are described. One is a coma-like sleep beginning a few hours after eating, with recovery around 6 hours later and sometimes as long as 72 hours. The other is amatoxin poisoning, with a 6 to 12 hour or longer delay before severe gastrointestinal distress.

The association also gives a clinical warning worth passing to a vet who does not see mushroom cases often: atropine should not be given for Amanita muscaria or A. pantherinoides ingestion, because it can deepen the coma-like sleep and increase the risk of death.

Reported signs of mushroom toxicity in dogs include vomiting, diarrhoea, liver failure, tremors and seizures, depending on the toxin group.

The pattern that catches owners out is the amatoxin course. Guidance on Amanita ingestion describes no signs at all for the first 6 to 24 hours, then vomiting and diarrhoea, then an apparent recovery lasting about a day, before liver failure sets in. A dog that vomited last night and is cheerful this morning can still be in serious trouble.

That is the whole argument for calling on the day rather than watching:

• Treatment works best before liver injury is established.
• Identification takes time, and having the specimen refrigerated and the photographs ready shortens it.
• The alternative costs you nothing but a phone call, and the poison centre will tell you if no action is needed.

For small dogs, the same amount of mushroom is a much larger dose. Puppies also chew indiscriminately, which is why lawn mushrooms are a routine call in spring and autumn.

The ASPCA's prevention advice is direct: remove mushrooms from yards daily and supervise pets outdoors. For a dog that eats things, a two-minute walk of the yard before letting it out is more effective than any product.

What helps over a season:

• Walk the perimeter after rain. Mushrooms appear within a day or two of a soaking, and fruiting is heaviest in late summer and autumn.
• Check under and around trees. Amanita species partner with tree roots, so they fruit near oaks, pines and birches rather than out in open turf.
• Bag and bin, gloves on, and do not tip mushrooms into the compost where the dog can reach them again.
• Remove the food source. Digging out buried wood is the only permanent fix, described on how to get rid of mushrooms in a lawn. Illinois Extension lists no recommended fungicide for these species, so a spray is not a substitute for the daily walk.

A photograph shortens the vet's guesswork; it does not replace the phone call. The ASPCA's own advice is to rely on trained professionals and experts in mycology rather than attempting identification independently, and Poison Control makes the same point for people: only experts in mushroom identification can distinguish poisonous species from harmless ones.

Use identification for what it is good at:

• Ruling a hazard in. A white cap with a cup-like volva at the base, or a rusty-brown cluster on buried wood, moves the case up the priority list immediately.

Do not use it to decide that nothing needs doing. If a mushroom has been eaten, the call is made on the eating, not on the identification.

For people, the number in the United States is Poison Control, 1-800-222-1222, free and available 24 hours a day. For dogs and cats, it is your veterinarian or ASPCA Animal Poison Control, (888) 426-4435.

Most are not, but you cannot tell which ones are, and the dangerous few can kill. PetMD puts it in numbers: of more than 10,000 mushroom species in the U.S., only about 100 are toxic, yet a single Amanita may contain enough toxin to be lethal. NC State College of Veterinary Medicine reported on 22 May 2025 that two dogs had died that week after eating death caps, and its clinician described the poisoning as nearly 100% fatal without treatment. PetMD says poisonings peak in September and October.

What does not put a dog at risk: sniffing mushrooms (Firehouse Animal Health Center notes toxicity comes only from eating), and grocery-store mushrooms sold for people, which the ASPCA says are generally not the concern. The working rule from Firehouse is to treat every garden mushroom as potentially dangerous. For which species matter, see toadstools poisonous to dogs.

With a dog in the yard, removal is about getting to the mushrooms before the dog does:

• Walk the yard after every rain and pick up what has appeared (Firehouse Animal Health Center); in the main season, the ASPCA suggests a daily walk.
• Take the whole mushroom, base included, with gloves or a bag over your hand, and put it in the household bin, not the compost or a pile the dog can reach.
• Supervise the dog outdoors in warm, damp weather (NC State).
• Teach a reliable 'leave' or 'drop' and use a lead in areas you have not checked (Vets Now).
• Remove the food source where you can. Mushrooms in lawns feed on buried wood and dead roots, and digging those out is the permanent fix described on how to get rid of mushrooms in a lawn.

If you find a mushroom with bite marks, or pieces missing, treat it as eaten and call your vet or ASPCA Animal Poison Control at (888) 426-4435.