Is Crown of Thorns Toxic to Cats?

Yes — Crown of Thorns is mildly toxic to cats

Crown of Thorns has irritating milky sap (like all Euphorbias) plus sharp thorns that deter most pets. The thorns themselves can cause mouth or paw injuries. Toxicity from sap is generally mild.

Symptoms in Cats

If your cat eats Crown of Thorns, watch for these symptoms (onset: Immediate):

Oral irritation
Vomiting
Skin irritation
Eye irritation if sap contacts

What To Do

Wash sap from skin/eyes. Rinse mouth. The thorns also pose a mechanical injury risk.

Cat-Safe Alternatives to Crown of Thorns

✓ Christmas Cactus ✓ Haworthia ✓ Echeveria

Quick Facts

Scientific Name

Euphorbia milii

Also Toxic to Dogs?

Yes (mild)

Toxic Compound

Diterpene esters

Toxic Parts

sap, thorns

Sources: ASPCA Animal Poison Control Center, Pet Poison Helpline. View full Crown of Thorns toxicity profile.