Mycoscout The short answer
Call your vet or an animal poison line now, while your dog still looks fine. In the US the ASPCA Animal Poison Control Center is on (888) 426-4435, 24 hours a day, and the Pet Poison Helpline is on (855) 764-7661, also 24/7; both may charge a consultation fee. In the UK, Animal PoisonLine, run by the Veterinary Poisons Information Service, is on 01202 509 000, 24 hours, and charges per call. Then bag a sample of the mushroom, photograph it where it grew, and do nothing to your dog that a vet has not told you to do.
Why you call before symptoms
The dangerous mushroom toxins are slow. The Merck Veterinary Manual notes that "a long delay of 6 to 12 hours often occurs with exposure to amanitins", with the liver primarily affected. By the time a dog vomits, the toxin has been absorbed. The same manual gives the triage rule vets use: species that cause signs within 3 hours are usually self-limiting, while those that cause signs more than 6 hours after ingestion are life-threatening. It also warns that a short delay is no guarantee, because a dog may have eaten a mix of species from the same patch.
In people, NAMA describes the same amatoxin pattern: 6 to 24 hours with no symptoms, about a day of vomiting and diarrhea, then an apparent recovery while the liver and kidneys fail. A dog that "got sick and then seemed better" is in the most dangerous phase, not out of it.
Merck adds the point this whole page rests on: "Visual identification can be difficult, even for experienced mycologists." If you do not know what the mushroom was, and you almost certainly do not, the right assumption is that it was toxic.
What to do, in order
- 1. Get what is left out of the mouth. If your dog is still chewing, remove the pieces. Do not punish; you need the dog calm for the next hour.
- 2. Call. Your own vet first if they are open, otherwise an emergency clinic or one of the poison lines above. Have ready: the dog's weight, roughly how much was eaten, when, and what you can see of the mushroom.
- 3. Bag a sample. Dig up a whole mushroom of the same kind, base included, with a spoon or knife. Put it in a paper bag or wrap it in a paper towel, not a sealed plastic bag, which turns it to mush. If your dog has vomited, bag some of that too; it can be examined for spores.
- 4. Photograph the mushroom before you pick it: from above, the underside, the whole stem with the base, and the spot where it grew (grass, mulch, under which tree). Our guide to photographing a mushroom for identification shows each shot.
- 5. Follow the vet's instructions and nothing else. No home remedies, no salt, no peroxide on your own initiative. If the dog has collapsed, is having convulsions or is struggling to breathe, Animal PoisonLine says to get immediate veterinary attention; go straight to the nearest clinic.
- 6. Remove the rest of the mushrooms from the yard once the dog is being looked after, so it cannot happen again tonight. Our lawn mushroom guide covers how.
Why no home vomiting. The Merck Veterinary Manual says treatment is "primarily directed at decontamination and intensive supportive care" and that there are no proven antidotes. Decontamination is a decision for the vet, who knows the timing, the dog's state and what else was eaten. Doing it yourself can injure the dog and can take away the vet's options.
What the vet will ask
Vets and poison lines work from the history, because the mushroom usually cannot be identified in time. Merck notes that the "history, time after ingestion at which clinical signs occur" shape treatment and prognosis. Expect these questions:
- When did the dog eat it, as precisely as you can say?
- How much: a nibble, a cap, several mushrooms?
- Where was it growing: lawn, mulch, a stump, under a particular tree?
- What did it look like: size, cap color, gill color, a ring on the stem, a sac or bulb at the base, growing in a ring or a cluster?
- Has the dog vomited, and when?
- Do you have a sample or photos?
Yard mushrooms that matter most for dogs
Any mushroom in the yard is a problem for a dog that eats things, but three groups come up again and again.
Green-spored parasol (Chlorophyllum molybdites): the large white lawn mushroom of the eastern and central US, growing in "lawns and meadows", often in rings, with gills that turn gray-green with age. NAMA calls it the most common cause of mushroom poisoning in North America in people, with severe vomiting and diarrhea. See the green-spored parasol page.
Destroying angels and death caps (Amanita species): pure white or olive, with a ring and a sac at the buried base, growing with oaks and other trees. The eastern destroying angel is "widely distributed and common in eastern North America", so it appears in grass under yard trees. HealthLinkBC advises removing fruiting mushrooms from the yard "if you have young children or pets in your household". See the destroying angel and death cap pages.
Little brown mushrooms on mulch, wood chips and stumps: some, such as the deadly galerina, contain the same amatoxins as the death cap, and none can be identified from a glance. Mulched beds deserve the same sweep as the lawn.
Before it happens again
Walk the yard after rain and after warm humid nights, which is when flushes appear, and pick and bag every mushroom, base included, into the trash rather than the compost. Check mulch and the bases of trees, not only the open lawn. Keep an eye on the dog during walks in parks and woods in late summer and fall, when the Amanitas fruit. And save the numbers above in your phone now; the day you need them you will not want to search.
Using an app after the call
An app is not a vet and should never delay the call. Once your dog is in hand and the vet is on the phone, Mycoscout can help you record what the mushroom looked like: it asks for the cap, gills, stem base and habitat photos, names the most likely species with a confidence level, and lists the dangerous look-alikes, which gives you species names to mention to the vet or poison line. It gives no medical or veterinary advice, cannot see a sac you did not dig up, and its answer is a lead for the vet, not a decision for the dog. How Mycoscout works.
Frequently asked questions
Dog ate a mushroom in the yard: what are the symptoms?
It depends on the species. Some cause vomiting and diarrhea within a few hours. The deadly amatoxin mushrooms cause nothing for roughly 6 to 12 hours, then vomiting, then an apparent recovery while the liver fails. Because the dangerous ones start late, do not use symptoms to decide whether to call; call your vet now.
Are yard mushrooms bad for dogs?
Some are. Yard species range from harmless to the green-spored parasol, which causes severe vomiting, to destroying angels under trees, which are deadly. Since nobody can tell them apart by looking, treat any yard mushroom a dog eats as poisonous and call.
Is the mushroom in my yard poisonous to dogs?
Nobody can tell from a glance, and the Merck Veterinary Manual notes that visual identification can be difficult even for experienced mycologists. Remove yard mushrooms while they are up, and if your dog has eaten one, bag a sample, photograph it and call your vet or an animal poison line.
Should I make my dog vomit?
Not on your own. Inducing vomiting at home can go wrong and can waste the window a vet would use. Call your vet or an animal poison line and follow their instructions.
Sources
How we checked this page: the Mycoscout team cross-checked every edibility, toxicity and look-alike statement against the sources below on October 31, 2026. It has not been reviewed by a mycologist.
- Overview of Mushrooms Toxic to Animals, Merck Veterinary Manual. Accessed October 31, 2026.
- Animal Poison Control, ASPCA. Accessed October 31, 2026.
- Pet Poison Helpline, Pet Poison Helpline. Accessed October 31, 2026.
- Animal PoisonLine, Veterinary Poisons Information Service (VPIS). Accessed October 31, 2026.
- Mushroom poisoning syndromes, North American Mycological Association. Accessed October 31, 2026.
- Chlorophyllum molybdites, MushroomExpert.com (Michael Kuo). Accessed October 31, 2026.
- Amanita bisporigera, MushroomExpert.com (Michael Kuo). Accessed October 31, 2026.
- Death cap mushrooms (Amanita phalloides), HealthLinkBC. Accessed October 31, 2026.
