Identifying a Mystery Houseplant: Is It Toxic to Cats?

Your description (thick cane-like stems, brittle branches, 6-inch asymmetrical heart-shaped leaves with white spots) suggests a cane begonia—non-toxic. If no flowers, consider croton, gold dust dracaena, polka dot plant, or caladium—all toxic to cats.

Take a leaf to a nursery for ID. Refer to the included comprehensive list of cat-toxic plants. When in doubt, place the plant out of reach.