§ Toxic plants · Apocynaceae · Checked Oct 2026
Is oleander toxic to cats and dogs?
Yes. Oleander (Nerium oleander) is toxic to cats and dogs, according to the ASPCA Animal Poison Control Center. Plant Smart rates its effects Critical, level 4 of 4.
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§ 010 · Signs
What to watch for
Signs include drooling, belly pain, diarrhea, dullness or depression, vomiting, irregular heartbeat, weak pulse, shock, weakness, collapse, trouble breathing and dilated pupils. Eaten in quantity, it can be fatal. Signs can start within hours; some take a day or more to show.
§ 020 · If it happened
What to do if your pet ate it
Call your vet or a pet poison hotline straight away, even if your pet seems fine: the ASPCA Animal Poison Control Center, (888) 426-4435, or Pet Poison Helpline, (855) 764-7661. Both are open 24 hours and charge a fee. Have the plant or a photo of it to hand, and don’t make your pet vomit unless a vet tells you to.
§ 030 · Same family
Other Apocynaceae plants toxic to pets
Oleander belongs to the Apocynaceae family. ASPCA lists these relatives too.
§ 040 · Questions
Questions about oleander and pets
Is oleander toxic to cats?
Yes. ASPCA lists oleander as toxic to cats.
Is oleander toxic to dogs?
Yes. ASPCA lists oleander as toxic to dogs.
What happens if my pet eats oleander?
Signs include drooling, belly pain, diarrhea, dullness or depression, vomiting, irregular heartbeat, weak pulse, shock, weakness, collapse, trouble breathing and dilated pupils. Eaten in quantity, it can be fatal. Plant Smart rates it Critical, level 4 of 4.
What should I do if my pet ate it?
Call your vet or a pet poison hotline right away, even before signs appear: the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. Both charge a fee. Have the plant, or a photo of it, to hand.