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Is Old Man Cactus toxic to cats?

NO (NON-TOXIC)
Good news, Old Man Cactus is a cat safe plant! While this plant is non-toxic, it may still irritate your cat's tummy and potentially cause vomitting or diarrhea if ingested.
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Scientific Name:Cephalocereus senilis
Family:Cactaceae
Detailed Write-up
Author:
Alec
Last Updated:
7/13/25

Is Old Man Cactus Toxic to Cats?

Cats are curious creatures known for their ability to climb, scratch, and chew on various objects in their environment. As a result, cat owners must be mindful of the plants they bring into their homes, as some may be toxic to their feline friends. One plant that often causes concern for cat owners is the old man cactus. The question remains: is old man cactus toxic to cats?

What is an Old Man Cactus?

The old man cactus, also known as the Cephalocereus senilis, is a slow-growing cactus native to Mexico. It is often grown as a houseplant because of its unique appearance—the plant has a woolly, white exterior resembling an old man’s beard. As it grows, it produces long stems and massive spikes. The old man cactus is a hardy plant that requires minimal maintenance and can live for decades.

Is Old Man Cactus Toxic to Cats?

While the old man cactus may be safe for humans, it is not entirely safe for cats. The plant contains numerous fine and stiff spines that can cause physical injury to the cat if ingested or in contact with the skin. Moreover, the old man cactus has been found to contain saponins, a group of compounds that are harmful to cats when ingested in large amounts.

What Are Saponins?

Saponins are a class of compounds that are naturally occurring in many plants, including the old man cactus. The term saponin is derived from the word "sapo," which means soap in Latin. They are known for their soapy or frothy texture when mixed with water and are commonly used in the production of soap, shampoo, and detergent. Saponins have many different properties, including being toxic to some animals, including cats.

How Do Saponins Affect Cats?

Saponins can cause gastrointestinal upset and damage the red blood cells in cats. Symptoms of saponin toxicity in cats include vomiting, diarrhea, abdominal pain, lethargy, and anemia. In severe cases, saponin toxicity may lead to death. It is, therefore, essential to ensure that cats do not come into contact with the old man cactus.

What Should You Do if Your Cat Eats the Old Man Cactus?

If you suspect that your cat has eaten the old man cactus or any part of it, it is crucial to take immediate action. Depending on the severity of the symptoms, treatment may vary. Here are a few steps that you can take:

  • Call your veterinarian: Contact your veterinarian immediately and provide as much detail as possible about the situation.
  • Observe your cat: Monitor your cat's symptoms closely and note any changes in behavior or health.
  • Provide supportive care: If necessary, provide supportive care, such as administering fluids or medication, to manage the symptoms.

Conclusion

In conclusion, the old man cactus is not entirely safe to have around cats. The cactus contains saponins, which can cause gastrointestinal upset and damage red blood cells in cats. Although the old man cactus may look appealing as a houseplant, cat owners should keep their feline friends away from the plant to avoid any potential danger.

If you have any concerns about your cat's behavior or health, contact your veterinarian immediately.

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