Is Dieffenbachia safe for dogs?

Yes, Dieffenbachia is toxic to dogs. It contains insoluble calcium oxalate crystals that cause mechanical irritation to the mouth, throat, and digestive tract when chewed or swallowed.

Symptoms begin almost immediately — sometimes with the very first bite — and include oral irritation, excessive drooling, vomiting, difficulty swallowing, and pawing at the mouth. Discomfort typically peaks within two hours and usually resolves within 12 to 24 hours, but swelling of the tongue or airway and difficulty breathing are serious signs that require emergency care.

Remove any remaining plant material from your dog's mouth and gently wipe the mouth with a wet cloth to clear oxalate crystals. Do NOT induce vomiting and do NOT give home antidotes without consulting a vet first. Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435, and seek emergency care immediately if you see facial or throat swelling, breathing changes, or persistent vomiting.

The entire plant — leaves, stem, and sap — contains insoluble calcium oxalate crystals, so any part that is chewed or swallowed can cause irritation. The crystals cause injury through direct mechanical contact with the tissues of the mouth and digestive tract rather than through a systemically absorbed chemical toxin.