Is Pencil Cactus Toxic to Dogs and Cats? (2026)
Euphorbia tirucalli
Advertisement
Quick facts
| Toxic to dogs | Yes |
|---|---|
| Toxic to cats | Yes |
| Toxic to horses | Yes |
| Toxic component | Diterpene esters in the milky latex sap (more concentrated than Poinsettia's) |
| Onset of symptoms | Immediate on contact |
| Indoor / outdoor | indoor |
If your pet ate this plant
Both lines are staffed 24/7. A consultation fee applies to each. Do not wait for symptoms to appear before calling.
Advertisement
Symptoms in dogs
- Severe mouth and throat irritation
- Vomiting
- Eye irritation/temporary blindness if sap contacts eyes
Symptoms in cats
- Severe mouth irritation
- Vomiting
Advertisement
What to do
Flush eyes or skin with water immediately if sap makes contact; contact a vet for ingestion. The sap is meaningfully more irritating than its Euphorbiaceae relative Poinsettia — treat this succulent-looking plant with more caution than its appearance suggests.
Toxic component and mechanism
The toxic component in Pencil Cactus is diterpene esters in the milky latex sap (more concentrated than poinsettia's).
What makes this plant different
Pencil Cactus's smooth, pencil-thin succulent stems look deceptively gentle, but its latex sap is meaningfully more concentrated and irritating than its Euphorbiaceae relative Poinsettia — eye contact with the sap is a genuine emergency in its own right, separate from ingestion.
Plant identification
- Scientific name
- Euphorbia tirucalli
- Family
- Euphorbiaceae
- Also known as
- Pencil Cactus, Sticks of Fire
- Typically found
- indoor
Advertisement
Related plants
Castor Bean Plant
Ricinus communis
Copperleaf
Acalypha godseffiana
Poinsettia
Euphorbia pulcherrima
Alocasia
Alocasia spp.
Aloe
Aloe vera
See all Euphorbiaceae plants →
Last verified: July 2, 2026 · Cross-referenced with ASPCA Animal Poison Control