Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My dog ate Sweet Marjoram - what should I do?
Origanum majorana
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 upset.
Escalation note
Ingestion usually results in mild digestive upset. Monitor your pet closely and contact a veterinarian if symptoms persist or if a large quantity was consumed.
What to watch for
Vomiting and diarrhea are the headline signs. You may also see drooling, hesitation to eat, or mild belly tenderness. Concerning signs are repeated vomiting beyond a day, blood in stool, severe lethargy, or any neurologic change after essential-oil exposure.
Time window
Signs usually start within 1–4 hours and clear within 12–24 hours with supportive care. Exact dose-response isn't documented for dogs by the cited source.
When to call the vet
Call if vomiting or diarrhea persists past 24 hours, the dog can't keep water down, or you see blood in vomit/stool. Call immediately for any contact with concentrated marjoram or oregano essential oil, especially in small or young dogs.
What this means for your dog
Dogs that grab a mouthful of marjoram from a herb pot or garden bed almost always end up with garden-variety digestive upset rather than a serious poisoning. ASPCA flags it as toxic because its essential oils irritate the GI tract, but a few chewed leaves rarely cause more than vomiting or loose stool. Larger ingestions or concentrated marjoram essential oil are a different story.
Sources: ASPCA (no first-aid guidance).
Source references
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.