What are the symptoms of Philodendron poisoning in cats?

oral pain, excessive drooling, swelling of mouth, vomiting

Philodendron

Q: Is Philodendron toxic to cats?

Toxic: Toxic — calcium oxalate crystals cause oral and GI irritation. Like pothos, philodendrons contain calcium oxalate crystals that cause oral pain, swelling, and drooling. A very common houseplant. Rarely fatal but uncomfortable. Cats may chew on leaves. Source: ASPCA.

Toxic

Verdict

Toxic — calcium oxalate crystals cause oral and GI irritation.

Toxic principle: calcium oxalate crystals

Source: ASPCA · Verified 2026-06-12

If your cat ate this

Cats hide symptoms — don't wait and see. Even small amounts of certain substances can be fatal to a cat. Act fast.

1. Call your veterinarian immediately
US — National hotline: ASPCA Animal Poison Control Center (888) 426-4435 aspca.org(24/7, Consultation fee may apply.)
US — National hotline: Pet Poison Helpline (855) 764-7661 petpoisonhelpline.com(24/7, $89 per incident fee; also covers Canada.)
GB — National hotline: Animal PoisonLine 01202 509 000 animalpoisonline.co.uk(24/7, £35 per call (8am–8pm weekdays), £45 at other times.)
AU — National hotline: Animal Poisons Helpline 1300 869 738 animalpoisons.com.au(24/7)
NZ — National hotline: Animal Poisons Helpline 0800 869 738 poisons.co.nz(11am–7pm NZ time (currently being extended), Charges apply.)
CA — National hotline: Pet Poison Helpline (855) 764-7661 petpoisonhelpline.com(24/7, $89 per incident fee.)

Verified 2026-08-06

Verdict

Like pothos, philodendrons contain calcium oxalate crystals that cause oral pain, swelling, and drooling. A very common houseplant. Rarely fatal but uncomfortable. Cats may chew on leaves.