Dogs
Potentially toxicConsulted references classify the plant as toxic or irritating for that pet type.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Sources
dog safety reference
Is Greek Oregano safe for dogs?
Origanum vulgare hirtum
Greek Oregano is a popular culinary herb known for its pungent, aromatic leaves and low-growing, spreading habit. While widely used in cooking, ingestion of large quantities by pets can lead to gastrointestinal distress.
Greek OreganoOreganoOriganum vulgareOriganum vulgare hirtum
- Light
- Full sun
- Habit
- Spreading, mounding
- Care
- Low
Safety status
What this means for your dog
Dogs that snack on garden oregano usually only get mild GI upset from the carvacrol and thymol oils in the leaves. ASPCA lists oregano as toxic but the typical clinical course is unimpressive — the danger spike is concentrated essential oil, not the herb itself.
What to watch for
Mild vomiting and diarrhea are the most common signs. Larger ingestions may cause lethargy and decreased appetite; oregano essential oil exposure can cause more pronounced GI signs and ataxia.
Time window
ASPCA does not publish onset or duration; GI signs typically appear within hours and resolve within 24 hours with supportive care.
When to call the vet
Call your vet or ASPCA Poison Control (888-426-4435) if vomiting persists, you see blood in stool, or your dog ingested oregano essential oil. A few chewed leaves usually do not require a visit.
Sources: ASPCA, NC State Extension (no first-aid guidance).
If a pet has chewed or swallowed plant material and is showing symptoms, contact a veterinarian or poison resource immediately. This product is for structured reference, not diagnosis.
Dogs — concern notes
Common signs
Vomiting, diarrhea, and potential gastrointestinal upset.
Escalation note
While generally mild, ingestion of large amounts can irritate the digestive tract. Consult your veterinarian if you observe persistent symptoms.
Safer alternatives
No hand-picked alternatives for this plant yet. You can still pick your own using the Compare button on any other plant.
Source evidence
ASPCA Toxic Plant List
toxicology · 99% reliability
Oregano is listed as toxic to both cats and dogs due to potential gastrointestinal irritation.
NC State Extension Plant Toolbox
botanical · 94% reliability
Origanum vulgare is a perennial herb in the Lamiaceae family, commonly used as a culinary spice.
Questions about Greek Oregano
Is Greek oregano toxic to dogs?
Greek oregano (Origanum vulgare hirtum) is considered potentially toxic to dogs. Ingestion can cause gastrointestinal upset, particularly in larger quantities, though the effects are generally mild.
What symptoms will my dog show after eating oregano?
The most common signs are vomiting and diarrhea. Larger ingestions may also cause lethargy and decreased appetite. Oregano essential oil is more concerning and can additionally cause ataxia (loss of coordination) and more pronounced GI signs.
What should I do if my dog ate Greek oregano?
A few chewed leaves typically do not require a vet visit — monitor your dog for vomiting or diarrhea, which usually resolve within 24 hours with supportive care. Call your vet or ASPCA Poison Control at (888) 426-4435 if vomiting persists, you see blood in the stool, or your dog was exposed to oregano essential oil rather than the herb itself.
Is oregano essential oil more dangerous to dogs than the fresh herb?
Yes. While fresh or dried Greek oregano leaves typically cause only mild GI upset, oregano essential oil is significantly more concentrated and can cause more pronounced gastrointestinal signs as well as ataxia. Contact your vet or ASPCA Poison Control at (888) 426-4435 immediately if your dog ingested any form of oregano oil.
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