Are the Mushrooms in My Yard Poisonous to Dogs?
By IdentifyThese Editorial · Reviewed · 3 min read
Most lawn mushrooms will not kill a dog. A few will, dogs eat them far more readily than people expect, and the ones that matter are common in ordinary gardens.
If your dog has eaten a wild mushroom, do not wait for symptoms. Call your vet or an animal poison line now. In the US, the ASPCA Animal Poison Control Center is (888) 426-4435 and the Pet Poison Helpline is (855) 764-7661.
Why waiting is the mistake
The most dangerous mushrooms produce amatoxins, and amatoxin poisoning has a shape that punishes patience.
There is a silent period of six to twelve hours with no signs at all. Then vomiting and diarrhoea. Then — and this is the part that kills — an apparent recovery lasting a day or two, during which the animal seems to improve while the liver is failing. By the time the second phase of illness arrives, treatment is far harder.
A dog that seems fine four hours after eating a mushroom is not evidence of anything. Treatment started early is dramatically more effective than treatment started when the animal looks unwell.
The ones that actually matter
| Group | Where it grows | Why it matters |
|---|---|---|
| Death cap and destroying angels (Amanita) | Under oak, birch and pine; lawns near mature trees | Amatoxins. The species responsible for most fatal mushroom poisonings in dogs and people |
| Deadly Galerina | On rotting wood, bark mulch, old stumps | Amatoxins, in a small brown mushroom nobody looks twice at |
| Fly agaric and panther cap | Under birch and pine | Not usually fatal, but causes severe neurological signs — staggering, tremors, seizures |
| False morel | Spring, on soil | Gyromitrin. Damages the liver |
| Inocybe* and *Clitocybe | Lawns, woodchip, garden borders | Muscarine. Drooling, vomiting, slow heart rate |
Bark mulch and woodchip deserve particular attention. Galerina fruits directly on decaying wood, which means a freshly mulched border is a place to look rather than a place to relax about.
What to do, in order
- Take the mushroom. Dig up the whole thing including the base — the buried part carries the features that identify it. Wrap it in paper, not plastic, and refrigerate it.
- Photograph it in place before you dig, from the side and from underneath.
- Call the vet or a poison line immediately. Say what happened and when.
- Do not induce vomiting unless you are told to. Timing and technique matter and both depend on what was eaten.
- Note the time. How long ago it was eaten changes the treatment.
Signs that mean go now
Vomiting, diarrhoea, drooling, staggering or lack of coordination, tremors, seizures, unusual lethargy, yellowing of the gums or eyes, collapse.
Any of these after a known or suspected mushroom is an emergency. So is a known ingestion with no signs at all.
Removing them from the lawn
Picking mushrooms does not remove the fungus — the mushroom is only the fruiting body, and the organism lives in the soil and wood below. Picking does remove what the dog can reach, which is the actual goal.
Walk the garden after rain, which is when they appear. Rake up and bin what you find rather than composting it. Clear leaf litter and dig out buried wood and old stumps, which is what most lawn fungi are living on. And keep the dog off freshly mulched beds for a while.
Identifying them yourself
Worth doing for your own understanding, and worth being clear about: an identification from a website or an app is not a basis for deciding a dog is fine. The features that separate a deadly Amanita from a harmless lookalike are partly underground, and the consequence of being wrong is liver failure.
If you want to understand what to look for, the three features to find first explains the volva, the ring and the spore print — and why digging rather than pulling is the habit that catches the most dangerous mistakes.
Read this before anything else
- Never eat a wild mushroom identified by a website or an app.That includes this one. These tools narrow possibilities; they cannot see your mushroom, its base, its smell or its habitat, and the difference between a meal and a liver transplant is sometimes a feature buried in the soil.
- Get it confirmed in person by an experienced local forager or a mycological society. Most regions have one, most run free identification sessions, and they will look at the actual specimen.
- Dig, do not pull. The cup at the base of a death cap is often underground. Pulling the mushroom leaves the most important feature in the soil.
- If someone has eaten a wild mushroom and feels unwell, call poison control now — in the US, 1-800-222-1222. Do not wait for symptoms to worsen. Amatoxin poisoning has a false recovery phase, and delayed treatment is what makes it fatal. Save any uneaten pieces for identification.
Keep reading
- The Amanita Check: Dig It Up, Every TimeMost fatal mushroom poisonings are one genus. Two features identify it, one is usually underground, and pulling the mushroom rather than digging destroys the evidence.
- How to Take a Spore Print — and Why It Matters So MuchA spore print costs nothing, takes a few hours, and separates several deadly mushrooms from the edible species they resemble. Here is how, and what each colour rules out.
- Identifying Trees in Winter, With No Leaves at AllBark, buds, twigs and last year's fruit on the ground. Winter identification is not harder than summer — it just uses different characters, several of them more reliable.