Is Holly toxic to cats?
Holly is mildly toxic to cats (S1 Caution): its saponins cause vomiting, diarrhea, and lethargy after eating the leaves or berries — low toxicity per the ASPCA — but the spiky leaves can also cut a cat's lips and gums, which is a mechanical injury rather than a poisoning.
- TOXINsaponins
- WHAT TO EXPECTvomiting; diarrhea; depression
- CALL THE VETCall your vet if vomiting or diarrhea persists or worsens, your cat stops eating, or mouth injuries from the leaves look deep or keep bleeding.
Symptoms
| SIGN |
|---|
| vomiting |
| diarrhea |
| depression |
| painful injury to lips and gums from chewing the spiky leaves (mechanical, not toxic) |
If your cat just ate it
Care at a glance
FAQ
My cat chewed holly and its mouth looks sore — is that poisoning?
Probably not poisoning — probably the leaves. Pet Poison Helpline notes that "physical/painful injury to the lips and gums of pets can occur secondary to chewing the spiky leaves," which is a mechanical injury from the spines, not an effect of the saponins. The poisoning signs on record are different: vomiting, diarrhea, and depression, which the ASPCA rates as low toxicity, hence S1 Caution. A sore mouth alone is a cut that should be looked at; a sore mouth plus vomiting or diarrhea is both things at once. Remove the holly, and if signs persist, call your vet.
Does this cover American holly, English holly, and winterberry?
Yes — this page is graded at the genus, Ilex spp. The ASPCA carries three holly entries, two for Ilex opaca (holly and American holly) and one for Ilex aquifolium (English holly), and all three record the same toxic principle, saponins, and the same signs — vomiting, diarrhea, and depression, with leaves and berries described as low toxicity. The entries even list each other as alternative names, so the ASPCA itself draws no line between the species. Pet Poison Helpline likewise writes Ilex spp. Winterberry and inkberry are alternative names on those entries and are covered by the same S1 Caution verdict.