Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My dog ate Mayweed - what should I do?
Anthemis cotula
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
Skin redness, blistering, oral irritation, and digestive distress.
Escalation note
The plant contains volatile oils that can irritate the skin and mucous membranes. Consult a veterinarian if your dog shows signs of discomfort or persistent vomiting.
What to watch for
Most common: contact dermatitis (red, itchy skin where the dog brushed the plant), vomiting, and diarrhea. Less common but worth noting: anorexia, allergic reactions, and — with chronic exposure — bleeding tendencies. Severity is usually mild-to-moderate from a one-time encounter.
Time window
ASPCA does not give a specific onset/duration. Contact dermatitis typically appears within hours of exposure; GI signs from ingestion usually show up the same day. Exact timing not well documented for this plant.
When to call the vet
Call your vet or the ASPCA Animal Poison Control Center (888-426-4435) if your dog has eaten more than a nibble, is vomiting repeatedly, has visible skin irritation that isn't improving, or stops eating. Routine brush-by contact with mild itching can usually be managed at home, but escalate if symptoms worsen.
What this means for your dog
Dogs should stay away from mayweed (also called stinking chamomile or poison daisy). The ASPCA classifies it as toxic to dogs because of volatile oils — bisabolol, chamazulene, anthemic acid, and tannic acid — that irritate skin and the GI tract on contact or ingestion.
Sources: ASPCA (no first-aid guidance).
Source references
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.