PupkeeperToxic
Is dieffenbachia (dumb cane) toxic to dogs?
Toxic. Chewing dumb cane releases sharp crystals that burn the mouth, causing pain, heavy drooling and vomiting.
If your dog ate or touched this, call your vet or a pet poison line now
United States
Poison lines in other countries: United Kingdom, Australia, Canada, New Zealand
What to do now
- Call your vet or a pet poison line now.
- Take any plant pieces away and rinse your dog's mouth with water.
- Bring a piece of the plant in a bag, or a photo, to help identify it.
- Go to a vet right away if your dog has trouble breathing.
Don't
- Don't make your dog vomit unless a vet tells you to.
- Don't give milk, oil, salt or other home remedies unless a vet tells you to.
Signs to watch for
- Burning, irritated mouth, tongue and lips
- Heavy drooling
- Vomiting
- Trouble swallowing
- Loss of appetite
- Trouble breathing from mouth and throat swelling
When signs appear: Right away (mouth pain)
Why
The plant contains insoluble calcium oxalate crystals and an enzyme that irritate the mouth and throat. The pain usually stops a dog from eating much.
Sources
- ASPCA Animal Poison Control: Dieffenbachia
- Merck Veterinary Manual: Houseplants and Ornamentals Toxic to Animals
- Pet Poison Helpline: Toxic Plants to Pets (first aid)
Guide reviewed 9 October 2026.
General information from the sources above, not a diagnosis. When in doubt, call your vet.