Is Oregano Toxic to Cats?

⚠️ 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.

Oregano is mildly toxic to cats. Eating fresh or dried oregano causes drooling, vomiting and diarrhea from its concentrated essential oils.

Also known as: Wild Marjoram, Pizza Herb, Origanum vulgare · Origanum vulgare

What makes it toxic

Carvacrol and thymol, phenolic essential oils that irritate the gastrointestinal lining in meaningful doses.

Warning signs to watch for

Drooling, vomiting, diarrhea and mild lethargy within a few hours of eating leaves or seasoning.

What to do if your cat eats it

Remove plant material, offer water and monitor. Call your vet if vomiting or diarrhea continues past a day.

Common questions

Is oregano worse for cats than basil?

Yes — basil is non-toxic, while oregano carries irritating phenols. Of the common kitchen herbs, oregano is one of the ones to keep from cats.

Is oregano oil safe as a natural remedy for my cat?

No. Concentrated oregano oil is a strong irritant and cats cannot metabolize it well. Never give essential oils to cats by mouth.

More plants checked for cats

Pothos☠️ ToxicYes, pothos is toxic to cats. Chewing the leaves or vines releases sharp calcium oxalate crystal Aloe Vera⚠️ Mildly ToxicAloe vera is mildly to moderately toxic to cats. The gel is famously soothing for human skin, bu Spider Plant✅ Non-ToxicNo, spider plants are non-toxic to cats. They are one of the best houseplants for homes with cur Easter Lily☠️ ToxicYes — and this is one of the most dangerous plants a cat can meet. Every part of an Easter lily,Sago Palm☠️ ToxicYes — sago palm is severely toxic to cats and among the deadliest houseplants. Every part contai Boston Fern✅ Non-ToxicNo, Boston ferns are non-toxic to cats — a classic choice for plant-loving cat households.

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.