Dieffenbachia spp.
Why is it risky?
Dieffenbachia contains insoluble calcium oxalate crystals plus proteolytic enzymes that amplify injury beyond what calcium oxalates alone produce. The combination causes immediate, severe oral burning and swelling of oral and pharyngeal tissue. In cats, oral swelling can compromise the airway, making Dieffenbachia potentially more dangerous than other calcium oxalate plants like Pothos, where airway risk is lower.
Affected Systems
Digestive · Respiratory
Symptoms
Immediate intense oral pain, drooling, foaming, pawing at mouth, swelling of lips, tongue, and throat, difficulty swallowing, dyspnea if airway swelling is significant.
What To Do
Contact vet immediately, airway compromise is possible. Rinse mouth with water. Emergency vet if any breathing difficulty is observed.
Notes
Dieffenbachia is more dangerous than Pothos or Peace Lily because of the additional enzymatic injury component, the swelling can last several hours to days. Handle with gloves when repotting, the sap irritates human skin and eyes as well.
Sources
→ ASPCA Animal Poison Control Center — https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/dumbcane
→ Pet Poison Helpline — petpoisonhelpline.com