Can Cats Eat Mushrooms?

Here is the puzzle with mushrooms: the ones in your grocery bag and the ones that appear overnight in your lawn look like the same food, and for a cat they are completely different propositions. A plain white button mushroom from the shop is, in a tiny piece, almost certainly harmless. A wild mushroom can be one of the fastest-acting poisons a cat ever meets. Because even experienced people misidentify wild species, vets draw the line in a very specific place, and it is worth understanding where and why.

Store-Bought Mushrooms: Low Risk, No Reward

The cultivated mushrooms sold for people, white button, cremini, portobello, shiitake, are not considered toxic to cats. A pea-sized piece of one, cooked plain, is unlikely to cause more than the mild stomach upset that any unfamiliar food can trigger. Cats gain nothing from it, though. Mushrooms are mostly water with trace B vitamins and minerals, and a cat’s body is built to extract what it needs from meat, not fungi. Some cats are also put off by the texture and earthy smell entirely.

If a piece of mushroom falls into your cat’s world, the preparation matters more than the species. Mushrooms cooked in butter, oil, cream sauces or, worst of all, garlic and onion are a different food from a plain mushroom, because garlic and onion are genuinely toxic to cats. Raw store-bought mushrooms are also harder for cats to digest. The safest version of this already-marginal food is a tiny piece, cooked in plain water or dry, with nothing on it. Many owners reasonably decide the reward is so small that the food simply stays a human one.

Wild Mushrooms: The Emergency

Wild mushrooms are where this topic turns serious. Several common species contain amatoxins, including the death cap (Amanita phalloides), destroying angels (Amanita species) and autumn skullcap (Galerina marginata). These toxins attack the liver. Other species cause neurological signs or violent gastrointestinal illness. Crucially, toxic species can look near-identical to harmless ones, and even specialists want a specimen in hand before they will name a mushroom. No owner should be making that call at home, in the garden, under time pressure.

The pattern of amatoxin poisoning is treacherous. After a latent gap of 6 to 24 hours with no signs at all, vomiting and diarrhoea begin. The cat may then appear to recover for a day while the liver damage silently continues, before jaundice, renewed vomiting, collapse and liver failure follow over the next few days. Treatment success depends heavily on how early support starts, which is why waiting for symptoms forfeits the best window.

Symptoms to Watch For

After any mushroom ingestion you cannot identify, watch for:

• Vomiting and diarrhoea, sometimes bloody, within minutes to hours for irritant species
• Excessive drooling, tearing eyes or a slowed heart rate (muscarinic-type mushrooms)
• Wobbliness, tremors, agitation, unusual sensitivity to sound or touch, or seizures
• Sudden lethargy and loss of appetite
• Yellowing of the gums, skin or whites of the eyes (jaundice), the hallmark of liver damage, which can be delayed by a day or more
• Drinking and urinating far more than usual, or passing very little urine at all, which can signal kidney damage from some species and may also be delayed

Observation is not a substitute for the phone call, but knowing these signs helps you update the vet accurately. Unsteady movement and behaviour changes are often easier to spot if you already know your cat’s normal patterns; our guide to cat sleeping positions and their usual routines makes the “something is off” moments stand out sooner.

What to Do If Your Cat Ate a Wild Mushroom

Phone your vet, an emergency clinic or a poison line immediately. The Pet Poison Helpline handles mushroom poisoning cases around the clock and can be reached on (855) 764-7661. Do not wait for symptoms; with amatoxins, the silent phase is precisely when help works best. If it is safe to do so, photograph the mushroom where it is growing and collect a sample (use a bag or paper towel, not your bare hands, and keep it away from the cat) or note any identical mushrooms nearby, because identification can change treatment. Tell the vet when the mushroom was eaten, how much is missing, and whether your cat has vomited.

At the clinic, early treatment focuses on decontamination, induced vomiting or activated charcoal where appropriate, followed by fluids, liver-protective medication and repeated blood tests to track liver values across the danger days. Never try to make your cat vomit at home.

Prevention is mostly gardening: walk your yard after rain, when mushrooms erupt, and pull any you find before your cat does an inspection of their own. Indoor cats are not entirely exempt; mushrooms occasionally fruit in houseplant soil. New cat households can fold this into the wider home-safety sweep in our new cat owner starter kit.

Frequently Asked Questions

Can cats eat raw mushrooms from the store?

Store-bought raw mushroom is not considered toxic, but it is harder for cats to digest than cooked and more likely to cause vomiting or diarrhoea. If you offer any at all, make it a tiny piece cooked plain. Given the zero benefit, most owners skip it.

How can I tell if a wild mushroom is safe for my cat?

You cannot, reliably, and neither can most people. Toxic Amanita species can closely resemble harmless mushrooms. The veterinary rule is to treat every wild mushroom as potentially lethal and get advice immediately after any ingestion.

My cat sniffed a wild mushroom but did not eat it. Is that okay?

Sniffing alone is not a poisoning route for the dangerous species; the toxins act when eaten. Move your cat away, remove the mushroom, and simply keep an eye out. The call to the vet is for chewing and swallowing, not curiosity.

Are mushrooms cooked with garlic ever safe for cats?

No. The problem there is not the mushroom but the garlic, which damages feline red blood cells. Mushrooms served in garlic butter, stir-fries, sauces or risottos should never be shared with a cat.

Can cats eat mushrooms on pizza or in mushroom soup?

Neither dish is a sensible way to share. Pizza mushrooms arrive with cheese, seasoned tomato sauce and often onion or garlic worked into the base or sauce. Mushroom soups and sauces are built on cream, butter and salt, again frequently with onion and garlic. The mushroom itself is rarely the problem in these dishes; everything cooked around it is. If your cat pilfers one plain piece from the top of a pizza, it is not an emergency, but neither dish should ever be offered deliberately.

What should I bring to the vet if my cat ate a wild mushroom?

Bring a photo of the mushroom in place and, if you can collect it safely in a bag without handling it directly, a sample for identification. Also note the time of ingestion and how much is missing. That information can steer treatment.

With mushrooms, the rule writes itself: the cultivated kind is a shrug, the wild kind is an emergency. Keep shop mushrooms plain and occasional at most, keep your cat away from anything sprouting in the grass, and treat every unidentified mushroom as the dangerous one until a vet tells you otherwise.

Related: Can Cats Eat Spinach?