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Is Water Hemlock toxic to cats?

YES (TOXIC)
Unfortunately, Water Hemlock is toxic and potentially harmful to cats. We recommend you keep your feline friends away from this plant. See the table below for more information.
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Additional Names:cowbane, poison parsnip
Scientific Name:Cicuta maculata
Family:Apiaceae
Toxic Principles:Cicutoxin
Clinical Signs:Diarrhea, seizures, tremors, extreme stomach pain, dilated pupils, fever, bloat, respiratory depression, and death
If you think your cat may have ingested a poisonous substance, call 888 426 4435 or your local vet
Detailed Write-up
Author:
Alec
Last Updated:
7/13/25

Is Water Hemlock Toxic to Cats?

Cats are curious creatures that love to explore their surroundings. As pet owners, it is our responsibility to make sure that our furry friends are safe from any potential dangers, including toxic plants. One such plant that may pose a threat to cats is water hemlock.

What is Water Hemlock?

Water hemlock (Cicuta douglasii) is a flowering plant that is native to North America. It grows in wet environments, such as marshes, and can reach heights of up to six feet. It is commonly known as the most poisonous plant in North America because of the toxin that it contains - cicutoxin.

Cicutoxin is a highly potent neurotoxin that affects the central nervous system. It can cause seizures, respiratory failure, and death, even in small doses. For this reason, water hemlock is considered to be a serious threat to both humans and animals.

How Can Cats Be Exposed to Water Hemlock?

Cats are known for their curiosity and tendency to nibble on plants. Water hemlock is particularly toxic because its root system is often mistaken for vegetables like parsnips or carrots. Cats that live in areas where water hemlock grows are at risk of exposure if they accidentally ingest any part of the plant. Additionally, cats that spend time outdoors or have access to outdoor areas may come into contact with water hemlock without their owners' knowledge.

What Are the Symptoms of Water Hemlock Poisoning in Cats?

Water hemlock poisoning in cats can be difficult to diagnose because its symptoms are similar to those of other types of poisoning. Cats that have ingested water hemlock may experience vomiting, diarrhea, abdominal pain, seizures, and difficulty breathing. In severe cases, water hemlock poisoning can lead to death within a matter of hours.

What Should You Do if You Suspect Your Cat Has Been Poisoned by Water Hemlock?

If you suspect that your cat has been exposed to water hemlock, seek veterinary care immediately. The sooner your cat receives medical attention, the greater the chances of survival. If possible, bring a sample of the plant or any part of the plant that your cat may have ingested. This can help the veterinarian determine the best course of treatment.

How Can You Prevent Water Hemlock Poisoning in Cats?

The best way to prevent water hemlock poisoning in cats is to keep them away from the plant. If you live in an area where water hemlock grows, make sure to remove any plants that may be growing in your yard or garden. If you're unsure whether a plant is water hemlock, consult with a knowledgeable professional.

Additionally, keep your cats indoors and limit their access to outdoor areas where water hemlock may grow. If you have an outdoor cat, supervise them at all times while they're outside. This will minimize their exposure to water hemlock and other potential toxins.

Conclusion

Water hemlock is one of the most poisonous plants in North America, and exposure to it can be deadly for cats. As responsible pet owners, it's up to us to keep our furry friends safe from harm. The best way to do this is to exercise caution and prevent our cats from coming into contact with water hemlock or other toxic plants. If you suspect that your cat has been poisoned by water hemlock, seek veterinary care immediately to give them the best chance of survival.

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