Toxic Mushrooms for Dogs: Fall Walk Hazards │ Joan of Bark

I’ve said it before, and I’ll say it again: “I never knew how much of the world was edible until I walked my black lab, Guinness.”

That boy could find a snack in a parking lot. And this fall, the snack I’m worried about is growing right in our yards. Toxic mushrooms for dogs are having a moment across the US, and not the good kind of moment. Reports are coming in that deadly death cap mushrooms are booming in yards this season, and it only takes one curious bite to turn a nice walk into an emergency vet visit.

So grab your leash and your coffee. Let’s talk about what’s popping up out there and how to keep your pup safe.

Mother Nature Saw a State Trooper

Have you noticed the weather lately? Mother Nature has been going from 90 degrees to 60 like she just saw a state trooper in her rearview mirror. All that heat, followed by cool nights and rain, is the perfect recipe for mushrooms. And they are everywhere.

I found a few questionable ones in our yard this week and pulled them immediately. I’m not a mushroom expert, and honestly, neither are most mushroom experts when it comes to telling the safe ones from the dangerous ones at a glance. According to the ASPCA, about 99% of mushrooms have little or no toxicity, but the 1% that are highly toxic can be life-threatening to pets. Since they’re so hard to tell apart, the safest rule is simple: treat every wild mushroom as toxic.

Benji Prefers Pee-Mail (But I Don't Take Chances)

Now, I know my boy. Benji is far more interested in reading his pee-mail than eating whatever is growing in the yard. He has a whole neighborhood of news to catch up on, and he takes that job very seriously.

But I still check. Every walk. Because you never know. The one time I bend over to pick up a pretty leaf is the one time he lunges for that white fluffy thing that looks exactly like a squeak toy. Dogs are fast, and mushrooms don’t come with warning labels.

What My Pet Sitting Days Taught Me

When I was a pet sitter walking my clients’ dogs, I was hypervigilant. I scanned every lawn, every curb, and every corner for anything questionable, whether it was something on the ground or another dog lurking around the corner. Those dogs weren’t mine, and I took keeping them safe very seriously.

I bring that same diligence with me every time I walk Benji. It becomes second nature after a while. Eyes up for other dogs, eyes down for anything he might want to taste, and a hand on the leash the whole time.

The Usual Suspects: Fall Walk Hazards to Watch For

Mushrooms get the headlines, but fall brings a whole lineup of things your dog might find irresistible. Here’s what I keep an eye out for:

Wild mushrooms: They pop up fast after rain, especially in shady spots, under trees, in mulch beds, and hidden in leaf piles. Some cause stomach upset, while others can damage the liver or kidneys or cause tremors and seizures.
Acorns: They contain tannins that can upset your dog’s stomach, and in smaller dogs they can cause an intestinal blockage.
Wet leaf piles: Crunchy, dry piles are mostly harmless fun. Damp, rotting piles can grow mold that causes vomiting, tremors, or seizures, and they’re a favorite hiding spot for ticks and mushrooms.
Black walnuts: Once they drop, they often grow mold, which can lead to tremors and seizures if your dog chews on them.
Rodent bait: As the weather cools, mice head indoors and people put out poison. Rat poison is extremely dangerous for dogs, so watch for bait boxes near garages and sheds on your route.
Antifreeze: Fall is winterizing season. Antifreeze tastes sweet to dogs and is highly toxic, so steer clear of puddles in driveways and parking lots.

What to Do If Your Dog Eats a Mushroom

First, take a breath. Then move quickly. With mushrooms, you don’t wait to see what happens.

Get it out of their reach. Remove any remaining pieces from your dog’s mouth and the area.
Call for help right away. Contact your vet, an emergency animal hospital, the ASPCA Animal Poison Control Center at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661. Both helplines are available 24/7, and a consultation fee may apply.
Do not make your dog vomit on your own. Only do this if a vet specifically tells you to. Doing it at home can cause more harm.
Save a sample or snap a photo. Wrap any mushroom pieces in a damp paper towel and put them in a paper bag, not plastic. A photo of where it was growing helps too.
Note the time. Your vet will want to know exactly when your dog ate it and what symptoms you’ve seen.

Here’s the scary part about the most dangerous mushrooms, like the death cap: symptoms can take hours to show up, and a dog can seem to bounce back before serious liver damage sets in. That’s why getting help early matters so much, even if your pup seems totally fine.

Signs Your Dog May Have Eaten Something Toxic

Call your vet if you notice any of these after a walk:

Vomiting or diarrhea
Drooling or pawing at the mouth
Stumbling, weakness, or seeming “off”
Tremors or seizures
Lethargy or not wanting to eat

Our Simple Habits for Safer Fall Walks

None of this means you have to stay inside until winter. Fall is the best walking season, full stop. A few easy habits go a long way:

Do a quick yard sweep. The ASPCA recommends removing mushrooms from your lawn every day during growing season. Wear gloves and toss them where your dog can’t reach.
Practice “leave it” and “drop it.” These two cues are your best friends on any walk. A few minutes of practice with treats at home pays off big on the trail.
Shorten the leash in mushroom zones. Shady, wooded, recently rainy areas, especially near oak trees, deserve a little extra attention.
Save the helpline numbers in your phone. You’ll never regret having them ready.
Light up for shorter days. It’s getting dark earlier, so a reflective leash or LED collar helps you see what’s on the ground and helps drivers see you.
Consider a basket muzzle for serious grazers. If your dog vacuums up everything on the trail, a well-fitted basket muzzle still lets them pant and drink while keeping snacks out.

And if you want to be extra prepared, this is a great time to check your pet first aid kit and make sure it’s stocked and ready.

Celebrate National Walk Your Dog Week and National Black Dog Day

Good news: you have the perfect excuse to put all of this into practice. National Walk Your Dog Week runs October 1 through 7, and it kicks off on National Black Dog Day, October 1.

Black Dog Day holds a special place in my heart. I had two black labs, Einstein and my snack-seeking Guinness, and they were some of the sweetest, goofiest, most loyal dogs I’ve ever known. Black dogs are often the last to be adopted from shelters, and it has nothing to do with who they are. So if you’re thinking about adding a dog to your family this October, which also happens to be Adopt a Shelter Dog Month, give those dark-coated sweethearts a second look. You might just find your own Einstein or Guinness.

Ready, Set, Sniff

Fall walks are one of my favorite things about this time of year. The air is crisp, the leaves crunch, and Benji gets a fresh edition of the neighborhood news every single morning. A little awareness is all it takes to keep it fun and safe.

So keep your eyes on the ground, your hand on the leash, and let your pup read all the pee-mail they want. Just skip the mushrooms.