Pet safety answer · Cited to ASPCA
Is Heartleaf Philodendron safe for dogs?
Why it's toxic
Toxic principles: Insoluble calcium oxalates
Clinical signs in dogs: Oral irritation, pain and swelling of mouth, tongue and lips, excessive drooling, vomiting (not horses), difficulty swallowing
Severity rating: moderate
Source
Classification per the ASPCA Toxic and Non-Toxic Plants database entry for Heartleaf Philodendron. Verified 2026-05-28. We update these answers when the source changes the classification.