Chamomile in animals: calming and skin

What is chamomile?

Chamomile is a collective name for various plant species from the family Asteraceae. In the context of veterinary medicine, two species are relevant: German chamomile (Matricaria recutita) and Roman chamomile (Anthemis nobilis, also known as Chamaemelum nobile). Both are used in folk veterinary medicine for calming complaints, skin irritation and gastrointestinal support, but they are not interchangeable and have different risk profiles.

Claims versus evidence

Proponents describe chamomile as a mild sedative, skin care agent and gastrointestinal supporter. German chamomile contains bisabolol and chamazulene — substances with demonstrated anti-inflammatory, antimicrobial and antispasmodic properties in vitro, that is to say: under laboratory conditions, outside the living animal [3]. These findings have not been translated into controlled clinical studies in dogs or cats. The available 'evidence' consists exclusively of anecdotal reports from integrative veterinarians. There is no published clinical evidence that chamomile is effective for any condition in dogs or cats.

Species-specific: dog vs. cat

In dogs, some integrative veterinarians occasionally apply German chamomile topically for mild skin irritation, or orally as a mild sedative or gastric support. This is not a standard treatment and is not recommended without veterinary supervision [3].

In cats, a markedly higher caution applies. Cats are particularly sensitive to aromatic compounds and essential oils. Severe vomiting, diarrhoea and bleeding tendency are possible complications with higher doses or prolonged use [1][2].

Toxicity: what does the ASPCA say?

Both German chamomile and Roman chamomile are on the ASPCA list of toxic plants for dogs, cats and horses [1][2]. The active toxic substances are essential oils, bisabolol, anthemis acid and tannins. Classified clinical signs of poisoning are vomiting, diarrhoea, anorexia, contact dermatitis upon external exposure and — with chronic use — bleeding tendency.

Small, incidental amounts usually lead to mild complaints. Chronic use or larger quantities pose a more serious risk, particularly in cats.

Interactions

Chamomile can interact with various commonly used veterinary medicinal products:

Use by the veterinarian

If a veterinarian considers chamomile, this is always within a broader clinical context — with attention to species, weight, existing conditions and concurrent medication. Never dose or administer without veterinary guidance. Self-treatment in cats is irresponsible given the ASPCA toxicity classification.

Conclusion

The claims surrounding chamomile in animals are greater than the evidence justifies. Laboratory data are interesting but not transferable to clinical practice without additional research. The ASPCA considers both species toxic to dogs and cats [1][2]. Integrative use in dogs is anecdotal; use in cats is riskier and is discouraged. Evidence grade: D (very weak/anecdotal) [1][2][3].