The Hidden Dangers of Autumn: Mushrooms, Acorns, and Other Seasonal Hazards for Dogs

Autumn may be the prettiest season of the year. The air gets crisp, leaves crunch underfoot, and every walk feels like a Hallmark moment waiting to happen. But while fall brings cozy vibes for us, it can also hide some sneaky dangers for our dogs, especially when those noses get busy exploring every new smell on the trail.

Let’s look at a few of the most common autumn hazards for dogs and how you can keep your furry friend safe while still enjoying every pumpkin-scented second of the season.

1. Mushrooms: The Forest’s Little Tricksters

Mushrooms pop up after cool rains, and while most are harmless, a few are downright dangerous for dogs. The problem is that toxic and non-toxic varieties often look nearly identical. Dogs that like to “sniff and snack” are at the highest risk.

Common toxic culprits: Amanita phalloides (the “death cap”) and Inocybe species — both can cause vomiting, seizures, liver failure, or worse.

Play it safe:

If you see mushrooms in your yard, remove them immediately. On walks, keep your dog on a leash and gently discourage sniffing unknown fungi. If your pup does eat one, call your vet or an emergency animal clinic right away. Don’t wait for symptoms.

2. Acorns and Oak Leaves: Nature’s Fall Confetti (That Dogs Shouldn’t Eat)

Acorns might look like toys, but they contain tannins, which can upset a dog’s stomach and, in large quantities, lead to serious kidney or liver issues. They can also be a dangerous choke hazard as well. Oak leaves share the same compound, and they’re just as risky when chewed.

What to do:

Sweep up acorns in your yard, and be mindful during park walks where oak trees are abundant. 

3. Molds and Rotting Leaves: The Hidden Allergen

Wet piles of leaves are basically a dog’s playground, but they can harbor mold spores, bacteria, and even parasites. Rolling or digging in them can trigger allergic reactions, sneezing, or itchy skin.

Best prevention:

Keep leaf piles tidy and dry. After outdoor play, wipe down your dog’s paws and coat to remove allergens and reduce the risk of skin irritation.

4. Fleas and Ticks Haven’t Retired Yet

It’s a common misconception that fleas and ticks disappear when temperatures drop. In truth, they thrive until it’s consistently below freezing.

Stay vigilant:

Keep your dog on a year-round flea and tick preventative and check their coat after hikes or time in tall grass. Pay special attention to ears, neck, and underbelly.

5. Seasonal Decorations and Candles

Autumn decor, from corn husks to scented candles, can tempt curious pups. Dogs may chew decorations, swallow small objects, or get too close to open flames.

Pet-proof your decor:

Keep candles out of tail range, avoid potpourri and essential oils (many are toxic to pets), and choose chew-resistant décor if your dog likes to “help” decorate.

The Lucky + Dog Takeaway

Autumn adventures with your dog are one of life’s great pleasures. You just need a little awareness to keep them safe. As you plan your fall outings, stock up on essentials that make exploring easier and safer: sturdy leashes, cozy outerwear, and maybe a few extra treats for good measure.

After all, every good fall walk deserves a wagging tail at the end.