Is Feather Cactus toxic to cats?

No — feather cactus 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. Mammillaria plumosa is not individually listed in the ASPCA toxic/non-toxic plant database, but the genus is clean: ASPCA lists the related Mammillaria fragilis (thimble cactus) as non-toxic to dogs, cats, and horses, and no Mammillaria species is listed as toxic (the only toxic "cactus" on the ASPCA list, pencil cactus, is an unrelated Euphorbia). It is treated as pet-safe; verify with your vet. Note the soft spines are still a physical hazard if chewed.

Yes — the ASPCA lists feather cactus 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: Feather Cactus is non-toxic to dogs as well. See the full feather cactus 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.