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Is Poison Sumac Toxic to Cats?

☠️ ToxicSeverity: Severe
✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit
⚠️ Educational info only. If your pet just chewed something and looks unwell, skip the reading and call your vet or Pet Poison Helpline (US): (855) 764-7661.
Yes, poison sumac is severely toxic to cats. Its urushiol oil causes intense skin and mouth inflammation, and swallowing plant material can injure the airway and gut.

Also known as: Thunderwood, Swamp Sumac · Toxicodendron vernix

What makes it toxic

Urushiol, a potent allergenic oil present in all parts of the plant. On skin it triggers severe delayed contact dermatitis; in the mouth and gut it burns and swells tissue.

Warning signs to watch for

Red, blistering itchy skin, or if chewed: drooling, swelling of mouth and throat, vomiting, difficulty breathing. Skin signs peak one to three days after contact.

What to do if your cat eats it

Bathe the cat with pet-safe degreasing shampoo to remove the oil, wear gloves, and go to the vet for any oral exposure or breathing difficulty. Do not let the cat groom oil onto other areas.

Common questions

Can my cat give me a rash from poison sumac?

Yes. Urushiol sticks to fur and transfers to your skin. Wear gloves when washing the cat and clean collars and bedding too.

Is poison sumac related to harmless sumac trees?

No. Staghorn and winged sumac with red berry clusters are unrelated and harmless. Poison sumac has drooping white berries and grows in wet areas.

More plants checked for cats

Pothos☠️ ToxicYes, pothos is toxic to cats. Chewing the leaves or vines releases sharp calcium oxalate crystalAloe Vera⚠️ Mildly ToxicAloe vera is mildly to moderately toxic to cats. The gel is famously soothing for human skin, buSpider Plant✅ Non-ToxicNo, spider plants are non-toxic to cats. They are one of the best houseplants for homes with curEaster Lily☠️ ToxicYes — and this is one of the most dangerous plants a cat can meet. Every part of an Easter lily,Sago Palm☠️ ToxicYes — sago palm is severely toxic to cats and among the deadliest houseplants. Every part contaiBoston Fern✅ Non-ToxicNo, Boston ferns are non-toxic to cats — a classic choice for plant-loving cat households.

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.