Which part of the iris is most dangerous to my dog?

The rhizomes (underground stems) and bulbs carry the highest concentration of the toxic terpenoids, so digging dogs that chew the roots are at greater risk than those that nibble a leaf or flower. All parts contain some toxin, but a dog that has unearthed and eaten a rhizome warrants prompt veterinary attention.

What symptoms should I watch for if my dog eats an iris?

Per the ASPCA, expect gastrointestinal upset: drooling/salivation, vomiting, diarrhea, and lethargy. Signs are usually self-limiting, but a small dog, a large ingestion, or persistent vomiting or diarrhea (risking dehydration) should be seen by a vet.

Are irises also poisonous to cats?

Yes. The ASPCA lists Iris species as toxic to cats as well as dogs, with the same toxic principles and similar gastrointestinal signs. Keep cut irises and garden plantings away from both species.

Are Irises Poisonous to Dogs?

Iris species · Iridaceae

Mildly ToxicAlso toxic to cats

Irises are mildly toxic to dogs.

Why it's toxic

The toxic compound in irises:

Pentacyclic terpenoids (zeorin, missourin, and missouriensin)

Symptoms to watch for

If your dog ate irises, watch for:

Salivation
Drooling
Vomiting
Diarrhea
Lethargy

What to do if your dog ate it

1Remove your dog's access to the irises and check how much may have been eaten.
2Do NOT induce vomiting unless a veterinarian or poison-control expert specifically tells you to.
3Call your veterinarian, the ASPCA Animal Poison Control Center (888) 426-4435, or the Pet Poison Helpline (855) 764-7661 right away.
4Note the amount eaten, the time, and your dog's weight and any symptoms — have this ready for the expert.
5Follow professional guidance and go to the nearest emergency vet if you are advised to.

📞 ASPCA Poison Control (888) 426-4435 📞 Pet Poison Helpline (855) 764-7661

A consultation fee may apply to the Pet Poison Helpline. When in doubt, contact your own veterinarian or nearest emergency clinic.

Frequently asked questions

Which part of the iris is most dangerous to my dog?: The rhizomes (underground stems) and bulbs carry the highest concentration of the toxic terpenoids, so digging dogs that chew the roots are at greater risk than those that nibble a leaf or flower. All parts contain some toxin, but a dog that has unearthed and eaten a rhizome warrants prompt veterinary attention.
What symptoms should I watch for if my dog eats an iris?: Per the ASPCA, expect gastrointestinal upset: drooling/salivation, vomiting, diarrhea, and lethargy. Signs are usually self-limiting, but a small dog, a large ingestion, or persistent vomiting or diarrhea (risking dehydration) should be seen by a vet.
Are irises also poisonous to cats?: Yes. The ASPCA lists Iris species as toxic to cats as well as dogs, with the same toxic principles and similar gastrointestinal signs. Keep cut irises and garden plantings away from both species.

Sources

ASPCA - Iris (Toxic and Non-Toxic Plants)

Last updated 2026-06-25

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This page is for general educational purposes and is not a substitute for professional veterinary advice. Toxicity can vary with the amount eaten, your dog's size, and individual sensitivity. If you suspect poisoning, contact a veterinarian or poison-control hotline immediately.