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Is Hyssop Toxic to Dogs?

⚠️ Mildly ToxicSeverity: Mild
✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit
⚠️ Educational info only. If your pet just chewed something and looks unwell, skip the reading and call your vet or Pet Poison Helpline (US): (855) 764-7661.
Hyssop is mildly toxic to dogs. Eating the herb causes stomach upset, and its ketone-rich essential oil is the part to keep away from pets.

Also known as: Garden Hyssop, Hyssopus officinalis · Hyssopus officinalis

What makes it toxic

Pinocamphone and other ketones in the essential oil, which irritate the GI tract and can affect the nervous system at higher doses.

Warning signs to watch for

Vomiting, diarrhea and drooling within hours of eating the herb; nervous signs are only expected from large amounts or concentrated oil.

What to do if your dog eats it

Offer water and monitor after leaf chewing. Contact your vet if vomiting continues or the dog seems unsteady.

Common questions

Is hyssop essential oil dangerous if my dog licks it?

Yes, more so than the leaves. Ketone-rich oils are absorbed quickly and affect the nervous system — keep bottles closed and never apply them to pets.

How much hyssop is too much for a dog?

A few leaves are unlikely to do more than cause mild drooling. A meal of the herb, or any amount of the oil, deserves a vet call.

More plants checked for dogs

Pothos☠️ ToxicYes, pothos is toxic to dogs. Chewing any part of the vine releases calcium oxalate crystals thaAloe Vera⚠️ Mildly ToxicAloe vera is mildly to moderately toxic to dogs. The skin and latex layer of the leaf contain coSpider Plant✅ Non-ToxicNo, spider plants are non-toxic to dogs. A dog that nibbles the arching leaves is not at risk ofEaster Lily⚠️ Mildly ToxicEaster lilies are only mildly toxic to dogs — they usually cause stomach upset, not the fatal kiSago Palm☠️ ToxicYes — sago palm is severely toxic to dogs, with a documented fatality rate around 50% when untreBoston Fern✅ Non-ToxicNo, Boston ferns are non-toxic to dogs. Chewing a frond will not poison your dog.

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.