Is St. John’s Wort toxic to dogs?

Yes. According to Plants4Pets, St. John’s Wort is toxic to dogs. Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin This entry has not been manually verified yet — treat it as guidance only.

Is St. John’s Wort toxic to horses?

Yes. According to Plants4Pets, St. John’s Wort is toxic to horses. Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin This entry has not been manually verified yet — treat it as guidance only.

Which pets are most at risk from St. John’s Wort?

Our database flags St. John’s Wort as toxic to: cats, dogs, horses.

What should I do if my pet eats St. John’s Wort?

Remove remaining plant material, do not induce vomiting unless a vet instructs you to, and seek professional help immediately with the plant name ready.

Is St. John’s Wort toxic to cats, dogs? (Hypericum perforatum)

St. John’s Wort (Hypericum perforatum) is marked as potentially toxic to cats, dogs, horses in the Plants4Pets database. Keep this plant out of reach of curious pets and read the species-specific notes below.

Photos of St. John’s Wort (Hypericum perforatum)

St. John’s Wort (Hypericum perforatum) — plant photo 1 of 2, pet toxicity guide

St. John’s Wort (Hypericum perforatum) — plant photo 2 of 2, pet toxicity guide

Is St. John’s Wort toxic to cats, dogs or horses?

Cat Toxic Not verified

Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin
Dog Toxic Not verified

Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin
Horse Toxic Not verified

Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin

Community confirmations show that other users find this rating helpful. They are not verified by our team.

St. John’s Wort plant details and common names

Family: Clusiaceae

Also known as: Klamath Weed

Safety advice if a pet eats St. John’s Wort

Many popular houseplants and garden species can cause vomiting, drooling, skin irritation or more serious symptoms when chewed by cats, dogs or horses. The information on this page is for educational purposes and does not replace a veterinary consultation.

If your pet has eaten any part of St. John’s Wort (Hypericum perforatum), note the amount ingested, watch for unusual behaviour and contact a veterinarian or pet poison helpline immediately.

Found outdated or incorrect data? Use the report form below or e-mail kontakt@plants4pets.pl with the plant name, species affected and your source — we review every submission.

FAQ: St. John’s Wort and pet toxicity

Is St. John’s Wort toxic to cats?: Yes. According to Plants4Pets, St. John’s Wort is toxic to cats. Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin This entry has not been manually verified yet — treat it as guidance only.
Is St. John’s Wort toxic to dogs?: Yes. According to Plants4Pets, St. John’s Wort is toxic to dogs. Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin This entry has not been manually verified yet — treat it as guidance only.
Is St. John’s Wort toxic to horses?: Yes. According to Plants4Pets, St. John’s Wort is toxic to horses. Photosensitization (ulcerative and exudative dermatitis). Toxic principles: Hypericin This entry has not been manually verified yet — treat it as guidance only.
Which pets are most at risk from St. John’s Wort?: Our database flags St. John’s Wort as toxic to: cats, dogs, horses.
What should I do if my pet eats St. John’s Wort?: Remove remaining plant material, do not induce vomiting unless a vet instructs you to, and seek professional help immediately with the plant name ready.

Clusia Rosea Clusia major

Report an error or missing data

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Wrong toxicity for a cat, dog or horse
Missing or incorrect plant name
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Include the plant name (Hypericum perforatum), affected pet species and, if possible, a link to your source. We usually respond within a few business days.