Most dogs love leashed walks, especially when they get the chance to sniff out new trails and explore new environments. My own dogs, Kona and Emma, are no exception. But before you head out to a new park or nature area, it’s critical to check whether the environment is safe—especially when it comes to toxic plants like poison hemlock.
A Favorite Walking Spot—Now a Hidden Danger
Just two miles from my home is White Rock Lake, a beloved Dallas destination offering 1,254 acres of walking and biking trails, lush greenery, and a scenic lake for kayaking, fishing, and sailing. It always felt like a safe haven for my leashed dogs to sniff and explore.
That changed recently when the city announced the discovery of poison hemlock—a highly toxic and invasive plant—growing around the lake. City crews are now actively working to remove it and have urged dog owners to avoid the area in the meantime.
What Is Poison Hemlock?
Poison hemlock is a biennial plant known for its lacy, fern-like leaves and umbrella-shaped clusters of small white flowers. It’s often mistaken for harmless plants like wild parsley or Queen Anne’s lace.
But don’t be fooled—this plant is one of the most poisonous in North America, and it poses a deadly risk to people and pets alike, including horses.
Why Is Poison Hemlock So Dangerous to Dogs?
Poison hemlock contains toxic alkaloids, including cicutoxin, which affect the nervous system. These compounds act fast, and symptoms can begin within minutes of ingestion.
Signs of Poison Hemlock Toxicity in Dogs
If your dog ingests any part of the plant, watch for these symptoms:
- Drooling
- Vomiting
- Diarrhea
- Muscle spasms
- Body tremors or shaking
- Hyperactivity
- Increased heart rate
- Seizures
- Collapse
- Sudden death
What to Do If You Suspect Hemlock Poisoning
Act fast. Time is critical with hemlock poisoning.
Call your veterinarian immediately or contact the ASPCA Poison Control Hotline at 888-426-4435, which is staffed 24/7.
Bring a sample of the plant to the clinic—carefully place it in a doggy poop bag and wash your hands thoroughly.
Do not wait for symptoms to worsen—early treatment significantly increases your dog’s chances of survival.
How Veterinarians Treat Poison Hemlock Exposure
Treatment typically involves:
- Inducing vomiting to eliminate any ingested plant material
- Administering activated charcoal to absorb remaining toxins
- IV fluids to rehydrate and support kidney function
- Sedation and oxygen therapy, if your dog is experiencing seizures or severe tremors
- Recovery may also include a bland, easy-to-digest diet and increased water intake to help the body heal.
Don’t Just Watch the Trails—Check Your Own Yard
Poison hemlock thrives in moist environments like ditches, fields, riverbanks, and roadsides. According to health officials, it’s now found in every U.S. state except Alaska, Florida, Hawaii, and Mississippi.
Be vigilant when walking your dog and routinely inspect your yard and nearby walking paths. Awareness is your best defense.
📚 Learn More & Be Prepared
Knowledge can save lives. You can learn more about toxic plants, emergency response, and how to protect your pet by taking our veterinarian-approved online Pet First Aid & CPR course at www.propethero.com.
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Stay alert. Stay informed. Keep your pets safe.
Because every walk should be a safe and joyful adventure. 🐾