Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My dog ate Water Hemlock - what should I do?
Cicuta species
Potentially toxic
Contact your veterinarian or an animal poison-control resource now, especially if any amount was chewed or swallowed.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Signs to watch for
Vomiting, violent seizures, muscle twitching, dilated pupils, and potential collapse.
Escalation note
Extremely severe; the toxins act rapidly on the nervous system. Contact a veterinarian or emergency animal poison control center immediately.
What to watch for
Pet Poison Helpline lists drooling, dilated pupils, weakness, agitation, nervousness, twitching, seizures, cardiac abnormalities, difficulty breathing, and death from respiratory paralysis. ASPCA adds diarrhea, extreme stomach pain, fever, bloat, and respiratory depression.
Time window
Pet Poison Helpline emphasizes that the time between symptom onset and severe poisoning can be very short and that prompt aggressive treatment is needed. Exact dose-to-onset varies; precise numbers are not published in the cited sources.
When to call the vet
Call your vet or ASPCA Animal Poison Control (888-426-4435) immediately on any suspicion — do not wait for symptoms. Pet Poison Helpline (855-764-7661) is also 24/7. Prompt seizure control and supportive care offer the only realistic chance.
What this means for your dog
Dogs — extremely toxic. ASPCA and Pet Poison Helpline both list water hemlock (Cicuta) as a serious threat: the toxin cicutoxin acts as a GABA antagonist in the central nervous system, and ingestion of even a small amount of root or stem can rapidly produce seizures and death. Hunting, farm, or off-leash dogs that chew the carrot-like roots after digging are the typical poisoning case.
Sources: ASPCA, Pet Poison Helpline.
Source references
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.