The phrase "dumb cane" refers to a type of plant called Dieffenbachia. It got its name because if you accidentally eat its leaves, it can make your mouth feel numb and make it harder to speak. Full definition
The family includes many other great indoor plants and toxic removing plants such as Aglaonema (Chinese evergreen), Anthurium (Flamingo flower), Caladium (use outdoors), Dieffenbachia (dumb cane), Zamioculcas zamiifolia (ZZ plant), Golden Pothos and Philodendron. (spaths.com)
- Some plants (indoor and outdoor) are poisonous to dogs so keep the following plants out of reach: poinsettias, azaleas, rhododendrons, dumb cane, Japanese yew, oleander, lilies and English ivy, among others. (k9magazine.com)
(Dieffenbachia seguine or dumb cane, to be exact) I immediately removed him from it. (1800petmeds.com)