Is White Cedar Toxic to Cats?
Also known as: Northern White Cedar, Eastern Arborvitae, American Arborvitae · Thuja occidentalis
What makes it toxic
Thujone and other monoterpene essential oils in the foliage and twigs. They inflame the stomach and intestines and, with heavy chewing, cross into nervous-system effects. Hedge trimmings concentrate fresh, tempting material.
Warning signs to watch for
Vomiting, diarrhea, drooling, weakness and abdominal pain within hours; large ingestions can add trembling, wobbliness or, rarely, seizures.
What to do if your cat eats it
Remove access and offer water. Call your vet if vomiting repeats or weakness appears, and bag fresh clippings immediately — dropped trimmings are the most common way indoor-adjacent cats meet this plant.
Common questions
Is arborvitae the same as white cedar?
Yes — Thuja occidentalis is sold under both names, plus eastern arborvitae. All refer to the same thujone-containing conifer.
Are cedar shavings or mulch a risk too?
Chewing fresh mulch can cause the same gut irritation, and strongly aromatic bedding is a separate respiratory concern for small animals. Discourage both habits.
More plants checked for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.