Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My cat ate Greek Oregano - what should I do?
Origanum vulgare hirtum
Potentially toxic
Contact your veterinarian or an animal poison-control resource now, especially if any amount was chewed or swallowed.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Signs to watch for
Vomiting, diarrhea, and potential gastrointestinal irritation.
Escalation note
Symptoms are typically mild, but ingestion of large amounts may cause discomfort. Please contact your veterinarian if your cat consumes significant quantities.
What to watch for
Mild vomiting and diarrhea are the most common signs. Watch for drooling and loss of appetite as well; concentrated essential oil exposure can be more severe than chewed leaves.
Time window
ASPCA does not publish onset or duration; GI signs typically appear within hours of ingestion and usually resolve within a day with supportive care.
When to call the vet
Call your vet or ASPCA Poison Control (888-426-4435) if vomiting or diarrhea persists more than a few hours, your cat refuses food, or you suspect exposure to oregano essential oil rather than the plant itself.
What this means for your cat
Cats lack the liver enzyme (glucuronyl transferase) needed to fully process the phenols and terpenoids in Greek oregano, so a few nibbles tend to hit them harder than they would a dog. ASPCA classifies oregano as toxic with mild GI signs in most exposures.
Sources: ASPCA (no first-aid guidance).
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.