Is Philodendron toxic to cats?
Philodendron hederaceum · Araceae
Yes. Irritating, no death documented.
Mild by default, and an emergency the moment swallowing or breathing is affected.
For a cat
Irritating
For a person
Irritating
What to watch for
- Oral irritation
- Pain and swelling of mouth, tongue and lips
- Excessive drooling
- Vomiting
- Difficulty swallowing
Fast. Drooling and trouble swallowing come on rapidly, which is the one mercy here: the pain is immediate, so a cat almost always spits the mouthful out before swallowing much of it. Watch the swallowing and the breathing over the next few hours, and call your vet if either changes.
Why, and which parts
Leaves and stems.
Toxic principle: Insoluble calcium oxalates
The name calcium oxalate suggests a chemical burn. It is closer to a mechanical one. The leaves carry specialised cells called idioblasts, packed with bundles of needle-sharp crystals held in a gel. Chewing bursts those cells, the gel swells, and the pressure fires the needles out with real force. They go on firing after the bite, down the throat and into the stomach, which is why the pain does not stop when the mouthful does. A proteolytic enzyme in the same sap then triggers a histamine release, so the tissue swells as well as being punctured. That swelling, and not the toxin, is what can turn this from painful into dangerous.
How to recognize it
Glossy heart-shaped leaves on a trailing or climbing stem, plain deep green in the commonest form. Sold under a dozen names, most of them describing the leaf shape rather than the plant.
Sold as: Heartleaf philodendron, Cordatum, Sweetheart plant. A label on a pot is a trade name, not a botanical one, and the two often disagree.
And for a person?
Mildly irritating to a person
The same crystals fire in a human mouth, and the effect is the same burning and swelling. The old name for dieffenbachia, dumb cane, comes from exactly this: a swollen tongue that cannot form words.
A plant's danger to a cat says nothing about its danger to you, and the reverse is just as true. This is a separate question with a separate answer.
This is information, not veterinary advice, and it cannot tell you what is wrong with your cat. Our rule is a simple one: if something is wrong with your cat, call your vet, and call an emergency clinic if it is out of hours. Nothing you read here is a reason to wait.
Worth keeping a paw on
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Other plants at the same level
Same verdict for a cat as Philodendron. The ones sharing its exact toxic principle come first.
