Rosemary Toxic?

Updated 2026-03-06| 3 min read| 3,587 found this helpful

Rosemary is confirmed non-toxic to cats, dogs, and horses, with no documented animal poisoning cases in available scientific literature

Despite its non-toxic status, rosemary is not approved or recommended for use as a feed source for any companion or livestock animals

Rosemary belongs to the Lamiaceae plant family, with a low risk of confusion with other visually or aromatically similar species in the same family

FAQ

Is Rosemary toxic to Humans?

No confirmed poisoning symptoms reported from standard exposure; mild gastrointestinal irritation or skin allergy may occur only in sensitive individuals or with extremely high intake (Non-toxic)

Is Rosemary toxic to Cats?

No reported poisoning symptoms; mild digestive upset possible only if very large quantities are consumed (Non-toxic)

Is Rosemary toxic to Dogs?

No reported poisoning symptoms; mild digestive upset possible only if very large quantities are consumed (Non-toxic)

Is Rosemary toxic to Horses?

No reported poisoning symptoms; mild digestive upset possible only if very large quantities are consumed (Non-toxic)

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Toxicity Details

Humans

Non-toxic

No confirmed poisoning symptoms reported from standard exposure; mild gastrointestinal irritation or skin allergy may occur only in sensitive individuals or with extremely high intake

Cats

Non-toxic

No reported poisoning symptoms; mild digestive upset possible only if very large quantities are consumed

Dogs

Non-toxic

No reported poisoning symptoms; mild digestive upset possible only if very large quantities are consumed

Horses

Non-toxic

No reported poisoning symptoms; mild digestive upset possible only if very large quantities are consumed

Toxicity Snapshot

Toxic PartsNo toxic parts confirmed; no animal poisoning cases have been published in scientific literature. Not suitable for use as animal feed.

Exposure RoutePrimary exposure route is ingestion; skin contact with fresh rosemary may cause mild, temporary irritation in sensitive individuals only

Toxic CompoundsNo confirmed toxic compounds at normal exposure levels; contains rosmarinic acid, camphor, and volatile essential oils that are safe in small doses

First Aid & Prevention

First 30 Minutes

• If an animal ingests an unusually large amount of rosemary, rinse its mouth with clean cool water to remove any remaining plant material
• Monitor the animal for signs of gastrointestinal discomfort (drooling, vomiting, diarrhea) for 2 hours after ingestion
• Remove all remaining rosemary from the animal's reach to prevent additional consumption

Contact Vet Immediately

• If the animal shows persistent vomiting, diarrhea, or lethargy after ingesting large quantities of rosemary
• If the animal has a known pre-existing allergy or sensitivity to Lamiaceae family plants
• If the ingested amount exceeds 10% of the animal's typical daily food intake

Prevention

• Do not use rosemary as a primary or supplementary feed source for any companion or livestock animals
• Store large bundles of fresh or dried rosemary out of reach of unsupervised young animals
• Clearly label garden plants if you grow toxic Lamiaceae species alongside rosemary to avoid accidental exposure

Treatment & Prognosis

• Supportive care only for mild symptoms, including access to fresh water and bland food for 24 to 48 hours post-exposure
• No specific antidote is required as no severe toxic effects are confirmed for standard rosemary exposure levels
• Consult a veterinarian or medical provider for targeted symptomatic treatment if adverse reactions occur

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Professional Toxicology

Scientific NameRosmarinus officinalis

AliasesAnthos

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesNon-toxic

Target Organs

No specific organ damage reported; potential mild gastrointestinal tract irritation only at extremely high intake levels

Mechanism of Action

• No confirmed toxic mechanism identified; extremely high doses of rosemary essential oil may cause mild gastrointestinal irritation due to its camphor content

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Ruminants (cattle, sheep, goats): No documented poisoning cases, but regular feeding of rosemary is not recommended due to its high essential oil content that may cause digestive upset at high doses

Small companion mammals (rabbits, guinea pigs, hamsters): Small, occasional quantities are safe, but consistent feeding is not advised as essential oils may disrupt sensitive gut flora

Confusion Risk

The following plants look similar and may be confused:

Common Sage Salvia officinalis

Both are aromatic Lamiaceae shrubs with similar evergreen leaf growth habits; sage leaves are wider, softer, and grayer in color, while rosemary leaves are thin, rigid, and needle-like

English Lavender Lavandula angustifolia

Both are woody, scented Lamiaceae plants adapted to similar growing conditions; lavender produces distinct purple spike-shaped flowers, while rosemary flowers are typically pale blue or white

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Related Toxic Plants

Wall Germander

Teucrium chamaedrys

Highly toxic to humans and animals, causing irreversible liver damage with regular consumption

Diviner's Sage

Salvia divinorum

Moderately toxic to humans and companion animals, causing neurological symptoms including hallucinations and disorientation

Perilla Mint

Perilla frutescens

Moderately to highly toxic to ruminants and horses, causing acute respiratory distress and organ damage

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Data Sources

1. ASPCA Animal Poison Control

2. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.