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Oxalates (Insoluble)


Poisonous to: Cats, Dogs

Level of toxicity: Generally mild to moderate

Common signs to watch for:

  • Drooling
  • Oral pain
  • Pawing at the mouth
  • Vomiting
  • Lack of appetite

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Insoluble calcium oxalate-containing plants include several types of common plants, including the Araceae family of plants, Dieffenbachia, Calla lily, Arrowhead, Dumbcane, Peace Lily, Philodendron, Pothos, Umbrella Plant, Elephant’s Ear, Chinese Evergreen, and Schefflera. Chewing or biting into these plant releases the crystals which penetrate tissue resulting in injury. When dogs or cats ingest insoluble calcium oxalate-containing plants, clinical signs may be seen immediately and include pawing at face (secondary to oral pain), drooling, foaming, and vomiting. Moderate to severe swelling of the lips, tongue, oral cavity, and upper airway may also be seen, making it difficult to breathe or swallow. Insoluble calcium oxalate-containing plants have a different mechanism of toxicity than soluble calcium oxalate-containing plants (e.g., star fruit, rhubarb, shamrock).

Poison type: Plants

Alternate names: Araceae, Dieffenbachia, Calla lily, Arrowhead, Dumbcane, Peace lily, Philodendron, Pothos, Golden Pothos, Umbrella plant, Elephant's ear, Chinese evergreen, Schefflera, pothos, satin pothos, African Evergreen, Green Gold Naphthysis, Arrow-Head Vine, Green Gold Nephthytis