Is Pencil Cactus safe for cats and dogs?

Cats: Toxic · Dogs: Toxic · Severity: Moderate. Pencil cactus (Euphorbia tirucalli), sold in nurseries as 'firesticks' for its orange-and-red winter color, has become one of the signature plants of California's shift toward drought-tolerant, low-water landscaping. UC Cooperative Extension's own plant-safety guidance for drought-tolerant gardens singles it out, warning that it 'has recently become an increasing health problem as many who garden with it have ended up in the hospital's emergency room' and flagging it as particularly dangerous because 'it appears harmless, having no spines or sharp edges to warn unsuspecting people or pets.' Two published medical case reports back that up: one documents a patient with acute keratoconjunctivitis after Euphorbia tirucalli latex contacted the eye, and another describes three separate ocular injury cases from the same plant's milky sap.

Species	Verdict
Cats	Toxic
Dogs	Toxic

Severity: Moderate

If your pet may have gotten into this: call ASPCA Animal Poison Control at 888-426-4435 or Pet Poison Helpline at 855-764-7661 right away. Both lines operate 24/7 (a consultation fee may apply).

Read the full first-aid guide: what to do if your pet ate something toxic

Pencil cactus (Euphorbia tirucalli), sold in nurseries as 'firesticks' for its orange-and-red winter color, has become one of the signature plants of California's shift toward drought-tolerant, low-water landscaping. UC Cooperative Extension's own plant-safety guidance for drought-tolerant gardens singles it out, warning that it 'has recently become an increasing health problem as many who garden with it have ended up in the hospital's emergency room' and flagging it as particularly dangerous because 'it appears harmless, having no spines or sharp edges to warn unsuspecting people or pets.' Two published medical case reports back that up: one documents a patient with acute keratoconjunctivitis after Euphorbia tirucalli latex contacted the eye, and another describes three separate ocular injury cases from the same plant's milky sap.

ASPCA lists pencil cactus as toxic to cats and dogs, with irritant sap (latex) as the toxic principle - it irritates the mouth and stomach and can cause vomiting and drooling, though ASPCA notes the plant is generally over-rated in toxicity compared to the eye risk. That mismatch matters for pet owners: the gastrointestinal risk from a nibble is usually mild, but sap flicked or rubbed into a pet's eye during play near a firesticks planting can cause a real corneal injury. Rinse any sap contact with the eye or skin with plenty of clean water right away; if irritation does not resolve quickly, call ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661), or see a veterinarian if an eye looks injured.

Facts and examples

UC Cooperative Extension's drought-tolerant-landscape plant-safety guidance warns that Euphorbia tirucalli ('fire sticks') 'has recently become an increasing health problem as many who garden with it have ended up in the hospital's emergency room,' and flags it as dangerous because it has no spines to warn people or pets. (source, verified 2026-07-29)
A published case report (Shlamovitz et al., Journal of Emergency Medicine, 2009) documents acute keratoconjunctivitis in a patient after Euphorbia tirucalli latex contacted the eye. (source, verified 2026-07-29)
A second case report (Hsueh et al., J Chin Med Assoc, 2004) documents three cases of ocular injury (corneal erosion, reduced visual acuity) from Euphorbia tirucalli latex sap. (source, verified 2026-07-29)

Verdict re-verified against aspca.org, 2026-07-29 — confirmed unchanged. Source

This page is for general information only and is not veterinary advice, diagnosis, or treatment. If your pet is showing symptoms, or you think they ate or touched something dangerous, contact your veterinarian or a pet poison-control hotline immediately.

Last verified 2026-07-29

Sources

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