For the first 30 to 60 minutes it is usually still sitting in his stomach. That is the only stretch of time where what you do at home still counts. So the first two things you do should take about a minute between them.

Take a picture of whatever is left. The mushroom, the plant, the wrapper. Almost nobody can tell one wild mushroom from another by looking, and that includes the people who will be helping you. “Small and brown” covers hundreds of kinds. From a photo, an expert has a chance. If you can, put a bag over your hand and pick one whole, including the base, and put it in the fridge. They can be gone by afternoon.

Then write down a time. Not when you noticed. Your best guess at when he actually got into it. That one number decides everything after it.

Now look at where the rest of that hour goes. Dogs don't act sick right away, so noticing takes time. Searching takes time. Then the call, then the drive, and for a lot of us the nearest emergency vet is forty minutes, not ten.

Here is the part that stings. You are a careful owner. You look things up. You have looked up chocolate, grapes, and the plant your sister brought at Christmas. You have never once looked at your own lawn.

And you can't fix that by looking harder.

So the thing you control isn't whether it happens. It's what you do in the hour after.

Do this from the house. You do not need to be in the car first.

Have four things ready. The photo, his weight, your best guess at the time, and roughly how much is gone.

They will tell you if this is a watch-at-home night or a get-in-the-car night. That one answer is the whole reason to call.

There is a fee. Pay it. It is the cheapest expert advice you will get all night, and a fraction of driving to the ER to be told he is fine.

Somebody is going to tell you to give hydrogen peroxide. It is not crazy advice. Making a dog vomit can be the right call. The role is just narrower than people think. Four things go wrong.

The timing. It only helps while the material is still in the stomach. Past that window you are making your dog sick for nothing.

The dose. What percentage? How many capfuls? The answers online contradict each other, and too much burns the throat and stomach.

The bottle. Peroxide weakens on the shelf. Do you know where yours is, and how old it is?

Cats. There is no safe way to make a cat vomit at home. The ASPCA says so plainly.

There is one thing you can give inside that hour. Activated charcoal.

It is full of tiny holes, so the poison sticks to it instead of crossing into the blood.

It also does not go anywhere. So when the liver drops that poison back into the gut for its second pass, the charcoal is already sitting there waiting for it.

It does not make your pet throw up. You give it while you get to the vet, not instead of going.

This is not a home remedy. It is what emergency clinics reach for. In one written-up case, a small dog ate a cane toad. Charcoal was the first thing they gave him. He went home fine the next day.