Is Western Red Cedar Toxic to Dogs?
Also known as: Giant Arborvitae, Pacific Red Cedar · Thuja plicata
What makes it toxic
Thujone-rich essential oils in leaves and bark, which act as gastrointestinal irritants and neurotoxins at higher doses.
Warning signs to watch for
Drooling, vomiting, mild diarrhea and sluggishness within hours. Large ingestions can cause tremors or incoordination.
What to do if your dog eats it
Stop the chewing, rinse the mouth and offer water. Call your vet if vomiting persists; tremors or collapse need emergency care.
Common questions
My dog sleeps in a cedar dog house — is that a problem?
Sleeping on cedar is usually fine, but heavy chewing of the walls or eating cedar bedding can cause the same thujone-related upset. Watch for drooling or vomiting.
Why do people plant western red cedar hedges if it is toxic?
It is a fast, dense evergreen and the risk is mild. Most dogs nibble once and stop, but persistent chewers should be kept away from fresh clippings.
More plants checked for dogs
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.