Is Pencil Cactus Toxic to Dogs?

Yes — Pencil Cactus is moderately toxic to dogs

The milky latex sap of Pencil Cactus is extremely caustic. Eye exposure can cause temporary blindness. Despite being sold as a low-maintenance houseplant, it poses serious risks to pets (and humans) if the stems are broken.

Symptoms in Dogs

If your dog eats Pencil Cactus, watch for these symptoms (onset: Immediate):

Severe skin and eye irritation
Oral blistering
Vomiting
Temporary blindness if sap contacts eyes

What To Do

Flush eyes immediately with water if sap contacts them. Wash skin thoroughly. See vet if oral exposure or eye damage suspected.

Dog-Safe Alternatives to Pencil Cactus

✓ Haworthia ✓ Echeveria ✓ Burro's Tail

Quick Facts

Scientific Name

Euphorbia tirucalli

Also Toxic to Cats?

Yes (moderate)

Toxic Compound

Diterpene esters (phorbol esters)

Toxic Parts

all parts (milky sap)

Sources: ASPCA Animal Poison Control Center, Pet Poison Helpline. View full Pencil Cactus toxicity profile.