Can Dogs Eat Mushrooms?

CONDITIONAL: Store-bought plain mushrooms are generally safe in small amounts; wild mushrooms can be deadly and require immediate veterinary attention.

CONDITIONAL: Store-bought plain mushrooms (like button, cremini, portobello) are generally safe in small amounts for most dogs, but wild mushrooms can be highly toxic or deadly — treat any wild-mushroom exposure as an emergency.

Quick Safety Summary

- Plain store-bought mushrooms (raw or cooked, unseasoned) are usually safe as an occasional treat in small amounts.

- Never give your dog wild mushrooms — many species contain powerful toxins.

- If your dog eats a wild mushroom, call your veterinarian, ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661) immediately; do not wait for symptoms.

- Keep mushroom-containing foods seasoned with onion, garlic, butter, or salt away — they pose separate risks to dogs.

Overview: Can dogs eat mushrooms?

Short answer: conditional. Cultivated edible mushrooms commonly sold in supermarkets (Agaricus bisporus varieties like white button, cremini, portobello) are broadly considered non-toxic to dogs and can be offered occasionally in small, plain servings. However, dozens of wild mushroom species are toxic and some — including the Amanita “death caps” and destroying angels — can cause severe liver failure and death in dogs.

This article explains nutritional value, safe serving sizes, what to avoid, how to recognize mushroom poisoning, and what to do in an emergency.

Nutritional value of common store-bought mushrooms

Cultivated mushrooms are low-calorie and provide modest nutrients. Example (raw white button, per 100 g — USDA data):

• Calories: ~22 kcal
• Protein: ~3.1 g
• Fat: ~0.3 g
• Carbohydrate: ~3.3 g (fiber ~1 g)
• Potassium: ~318 mg
• Selenium, B vitamins (niacin, riboflavin) in small amounts

Safe serving sizes by dog weight

If you choose to feed plain store-bought mushrooms, keep servings small and infrequent. The following are conservative guideline portions of cooked or raw plain mushroom (no butter, oil, salt, garlic, onion, or sauces):

• Toy/small dogs (<10 lb / <4.5 kg): 1–2 thin slices (~3–5 g)
• Small dogs (10–25 lb / 4.5–11 kg): 1 small mushroom or 2–3 slices (~10–15 g)
• Medium dogs (26–50 lb / 12–23 kg): 2–4 small mushrooms (~20–30 g)
• Large dogs (50+ lb / >23 kg): up to 5–8 small mushrooms (~30–50 g)

Are cooked mushrooms safer than raw?

• For store-bought edible mushrooms: both raw and cooked plain mushrooms are generally safe. Cooking can make them easier to chew and digest and may reduce bacterial contamination risks.
• For wild mushrooms: cooking does NOT reliably destroy many mushroom toxins (amatoxins, orellanine, muscarine, psilocybin, etc.). Do not assume cooking makes a wild mushroom safe.

Toxic wild mushroom groups to know (high-level)

• Amanita species (e.g., Amanita phalloides, Amanita virosa, “destroying angels”): contain amatoxins — cause severe, often fatal liver failure. Typical species implicated in pet deaths worldwide.
• Gyromitra (false morels): contain gyromitrin, metabolized to monomethylhydrazine — can cause seizures, vomiting, and liver toxicity.
• Inocybe and Clitocybe species: can contain muscarine — cause cholinergic signs (salivation, bradycardia, vomiting, diarrhea, difficulty breathing).
• Cortinarius species: contain orellanine — cause delayed kidney failure (symptoms may appear days later).
• Psilocybin-containing species: cause neurological signs (disorientation, ataxia, tremors, hallucination-like effects).

Symptoms of mushroom poisoning in dogs

Signs depend on the toxin present and can be immediate or delayed. Common presentations include:

• Early gastrointestinal: vomiting, diarrhea (sometimes bloody), abdominal pain, drooling, decreased appetite
• Neurologic: lethargy, ataxia, weakness, tremors, seizures, disorientation, coma
• Autonomic/cholinergic: excessive salivation, tearing, urinary incontinence, slow heart rate
• Hepatic signs (with amatoxins): jaundice (yellow gums/eyes), severe abdominal pain, clotting abnormalities, progressive weakness — often delayed 24–72+ hours after ingestion
• Renal signs (with orellanine): increased thirst/urination, decreased urine, elevated kidney values — may be delayed for days
• Collapse and death in severe cases

What to do if your dog eats a mushroom

If the mushroom was store-bought, confirm what it was (brand, can vs. fresh). If it was wild, treat it as potentially toxic.

Immediate steps (wild or unknown mushroom ingestion):

Emergency care at the clinic may include decontamination (activated charcoal, emesis if appropriate), intravenous fluids, bloodwork to monitor liver and kidney function, medications to control vomiting and seizures, and intensive supportive care. Some toxins (e.g., amatoxins) have no specific antidote and require aggressive supportive therapy; early treatment improves outcomes.

Identification pitfalls and why “if you wouldn’t eat it, don’t give it to your dog” matters

Identifying mushrooms reliably requires expertise. Several edible and toxic species look very similar — mistakes that are dangerous for humans are even more so for pets. Because of look-alikes, it’s wise to follow a simple rule: if you wouldn’t eat that mushroom yourself (or wouldn’t be 100% sure of its identity), don’t let your dog eat it.

Also remember that other mushroom-containing foods (pizza, casseroles, soups) may be prepared with harmful seasonings (onion, garlic), high fat, or preservatives; avoid feeding these to dogs.

When store-bought mushrooms are not safe

• Seasoned or sauced mushrooms (garlic, onion, butter, cream) — avoid.
• Canned mushrooms with high sodium, preservatives, or gluten-containing ingredients may be poor choices.
• Dogs with food sensitivities, pancreatitis, or compromised kidneys/liver should not be given new foods without veterinary approval.

Reputable sources and further reading

• ASPCA Animal Poison Control: https://www.aspca.org/pet-care/animal-poison-control
• Pet Poison Helpline — Mushrooms: https://www.petpoisonhelpline.com/poison/mushrooms/
• American Veterinary Medical Association (AVMA) resources on toxicology
• Veterinary toxicology textbooks (e.g., clinical references on amatoxin, gyromitrin, muscarine toxicities)

Key Takeaways

• CONDITIONAL: Store-bought plain mushrooms are generally safe in small amounts; wild mushrooms can be deadly.
• If your dog eats a wild or unidentified mushroom, treat it as an emergency — call your vet, ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661) immediately.
• Cooking does not reliably destroy many wild mushroom toxins.
• Avoid mushrooms prepared with onion, garlic, high fat, or heavy salt.
• Rule of thumb: if you wouldn’t eat it yourself, don’t give it to your dog.

Frequently Asked Questions