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Is Pencil Cactus toxic to cats?

YES (TOXIC)
Unfortunately, Pencil Cactus 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:Sticks of Fire
Scientific Name:Euphorbia tirucalli
Family:Euphorbiaceae
Toxic Principles:Irritant Sap (latex)
Clinical Signs:Irritating to the mouth and stomach, sometimes causing vomiting, but generally over-rated in toxicity.
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 Pencil Cactus Toxic to Cats?

Introduction

Growing plants indoor can provide numerous benefits for people, including cleaner air, increased productivity and stress relief. However, for pet owners, it is important to be aware of whether the plants they have at home can pose hazards to their furry friends. One common houseplant that has been a subject of concern among cat owners is the pencil cactus. This article will discuss the potential toxicity of pencil cactus to cats, the symptoms of poisoning, and the steps you can take to keep your pet safe.

What is a Pencil Cactus?

The pencil cactus (Euphorbia tirucalli), also known as milkbush or firestick plant, is a succulent plant commonly found in tropical and subtropical regions around the world. The plant can grow up to 30 ft in its native environment, but when grown indoors it usually reaches a height of 4 to 6 ft. The pencil cactus is known for its pencil-shaped green stems that turn orange or red in full sun and its small leaves that fall off easy. The plant is easy to care for and often used as a decorative houseplant.

Is Pencil Cactus Toxic to Cats?

Unfortunately, the pencil cactus is toxic to cats. The plant produces white sap, which contains diterpene esters and other toxic compounds that can cause poisoning in animals and humans. When a cat bites or ingests any part of the plant, it can experience a range of symptoms varying from mild to severe. Although the symptoms depend on the amount and type of toxin ingested, most cats will experience gastrointestinal, skin, respiratory, and nervous system problems.

What are the Symptoms of Pencil Cactus Poisoning in Cats?

If you suspect your cat has ingested any part of the pencil cactus, you should take immediate action. The symptoms of poisoning can occur within a few hours of ingestion and can range from mild to severe. Some common symptoms of pencil cactus poisoning in cats include:

  • Vomiting
  • Diarrhea
  • Dehydration
  • Loss of appetite
  • Excessive drooling
  • Redness and inflammation of the skin and eyes
  • Coughing, sneezing, and difficulty breathing
  • Weakness and lethargy
  • Uncoordinated movement and muscle tremors
  • Seizures and collapse

What Should You Do If Your Cat is Poisoned?

If you suspect your cat has ingested any part of the pencil cactus, you should take immediate action. Here are some steps you can take to help your cat:

  1. Seek veterinary care immediately. Pencil cactus poisoning can progress rapidly and can be fatal if left untreated.
  2. Bring a sample of the plant to the vet. This will help the vet identify the plant and determine the best course of treatment.
  3. Do not induce vomiting unless advised by the vet. Some plants can cause more harm when brought back up.
  4. Flush your cat's mouth with water to remove any remaining plant material.
  5. Keep your cat calm and confined while you take it to the vet. Try to minimize any movement to prevent the toxin from spreading throughout their body.

How Can You Prevent Your Cat from Getting Poisoned?

Prevention is the best way to keep your cat safe from pencil cactus poisoning. Here are some steps you can take to prevent accidental poisoning:

  • Do not keep pencil cactus in your home if you have cats or dogs
  • Place the plant in an inaccessible area, or keep it in a room that your pet cannot access
  • Teach your cat to avoid the plant by using positive reinforcement techniques
  • If you must keep the plant in your home, make sure to supervise your pet at all times
  • Consider using cat deterrent sprays and barriers around the plant

Conclusion

In conclusion, the pencil cactus is toxic to cats and therefore should be avoided when possible. The plant contains toxic compounds that can cause a range of symptoms in cats, including gastrointestinal, skin, respiratory, and nervous system problems. If you suspect your cat has ingested any part of the plant, seek veterinary care immediately. As a pet owner, the best way to keep your cat safe is to prevent accidental poisoning by keeping toxic plants out of reach, supervising your pet at all times, and educating yourself about the potential dangers of certain plants.

Sources:
https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/pencil-cactus
https://www.petpoisonhelpline.com/poison/pencil-cactus/
https://www.vetmed.wsu.edu/outreach/Pet-Health-Topics/categories/plants/poisonous-plants/pencil-cactus-(Euphorbia)-toxicity
https://kelownavet.ca/blog/post/2020/07/14/is-the-pencil-cactus-poisonous-to-cats.aspx
https://www.desertvalleyhosp.com/is-pencil-cactus-poisonous/
https://www.thespruce.com/euphorbia-tirucalli-profile-4849715

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