Is Japanese Arborvitae toxic to cats?

No — japanese arborvitae is listed by the ASPCA as non-toxic to cats. It is a sensible choice for a home with a cat; a curious nibble will not poison them, though no plant is meant to be eaten. Thuja standishii is not individually listed by the ASPCA, but arborvitae species (Thuja genus) are not classified as toxic to cats, dogs, or horses on ASPCA toxic plant lists. Foliage contains low levels of thujone, but ASPCA does not flag the genus as toxic. Considered pet-safe; monitor pets if large quantities are ingested and consult a vet if symptoms arise.

Yes — the ASPCA lists japanese arborvitae as non-toxic to cats and dogs. A cat that chews a large amount of any foliage can still get a mild, brief stomach upset, so discourage grazing, but it will not be poisoned.

The ASPCA classification Growli uses applies to both cats and dogs: Japanese Arborvitae is non-toxic to dogs as well. See the full japanese arborvitae pet-safety guide for both species.

Reliable ASPCA non-toxic picks for a cat home include spider plant, calathea, parlor palm, peperomia, and most true ferns. Browse the best cats-safe plants list to check more before you buy.