Is thyme toxic to cats and dogs?

No, thyme (Thymus vulgaris) is classified as non-toxic to cats, dogs, and horses by ASPCA. There are no documented animal poisoning cases from thyme.

Thyme Toxic?

Updated 2026-03-06| 4 min read| 1,003 found this helpful

Thymus vulgaris (thyme) is confirmed non-toxic to cats, dogs, and horses per official ASPCA toxicology data

No published veterinary literature records poisoning cases associated with thyme exposure in any animal species

Despite being non-toxic, thyme is not approved or recommended for use as primary or supplemental animal feed

FAQ

Is Thyme toxic to Humans?

No adverse effects expected from normal culinary or incidental exposure; very large overconsumption may cause mild temporary gastrointestinal upset (Non-toxic)

Is Thyme toxic to Cats?

No toxic symptoms expected from incidental exposure; ingestion of extremely large volumes may trigger mild temporary digestive discomfort (Non-toxic)

Is Thyme toxic to Dogs?

No toxic symptoms expected from incidental exposure; ingestion of extremely large volumes may trigger mild temporary digestive discomfort (Non-toxic)

Is Thyme toxic to Horses?

No documented toxic symptoms; consumption of very large quantities may cause mild gastrointestinal irritation (Non-toxic)

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Toxicity Details

Humans

Non-toxic

No adverse effects expected from normal culinary or incidental exposure; very large overconsumption may cause mild temporary gastrointestinal upset

Cats

Non-toxic

No toxic symptoms expected from incidental exposure; ingestion of extremely large volumes may trigger mild temporary digestive discomfort

Dogs

Non-toxic

No toxic symptoms expected from incidental exposure; ingestion of extremely large volumes may trigger mild temporary digestive discomfort

Horses

Non-toxic

No documented toxic symptoms; consumption of very large quantities may cause mild gastrointestinal irritation

Toxicity Snapshot

Toxic PartsNo toxic plant parts identified; no animal poisoning cases have been documented in available literature, though the plant is not suitable for use as animal feed

Exposure RouteIncidental ingestion, casual skin contact; no toxic effects are expected from either route at standard exposure levels

Toxic CompoundsNo identified toxic principles; primary active constituents include thymol, carvacrol, and non-toxic volatile essential oils

First Aid & Prevention

First 30 Minutes

• If large quantities are ingested, offer small sips of fresh water to reduce potential digestive irritation
• Wipe any remaining plant residue from the animal's mouth, paws, or skin to eliminate further exposure
• Monitor the animal for unusual signs of discomfort for 2 to 4 hours following exposure

Contact Vet Immediately

• If the animal shows persistent vomiting, diarrhea, or lethargy after ingesting a very large volume of thyme
• If you suspect the ingested plant may be a less common, potentially toxic Thymus species rather than common garden thyme
• If the animal has pre-existing gastrointestinal conditions or plant allergies that may be triggered by exposure

Prevention

• Store dried culinary thyme in sealed, out-of-reach containers to prevent pets from consuming large quantities accidentally
• Do not offer fresh or dried thyme as a feed supplement for livestock including horses, cattle, and small ruminants
• Confirm the identity of all Thymus species grown in pet/livestock accessible areas to avoid exposure to potentially toxic related varieties

Treatment & Prognosis

• Supportive care only as needed for mild digestive upset, including access to water and a bland diet for 12 to 24 hours if gastrointestinal signs appear
• No specific antidote is required, as no toxic effects are expected from typical thyme exposure
• Address rare allergic reactions with standard antihistamine or supportive care as prescribed by a licensed medical or veterinary provider

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Professional Toxicology

Scientific NameThymus vulgaris

AliasesCommon Thyme、Garden Thyme、German Thyme

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesNon-toxic

Target Organs

No target organs of toxicity identified

Mechanism of Action

• No toxic mechanism identified; plant constituents are not known to cause cellular or organ damage at typical exposure levels

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle, sheep, and goats: No documented toxic effects from incidental exposure, but thyme is not approved as a feed source and may cause mild digestive upset if eaten in large volumes

Small companion mammals (rabbits, guinea pigs, hamsters): Small incidental consumption is not expected to cause harm, though thyme is not a recommended part of their regular staple diet

Domestic birds and poultry: Small quantities of culinary thyme are commonly used as a poultry supplement with no reported toxic effects, though excessive intake may cause mild digestive irritation

Confusion Risk

The following plants look similar and may be confused:

Lesser-documented wild Thymus species Multiple Thymus spp.

Many rare or wild Thymus varieties may have untested chemical profiles. Common garden thyme can be distinguished by its broad, fuzzy grey-green leaves and distinct warm, savory aromatic scent.

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Related Toxic Plants

Pennyroyal

Mentha pulegium

High toxicity; can cause liver and organ failure in humans, dogs, cats, and livestock even in small doses

Perilla Mint

Perilla frutescens

Moderate to high toxicity; especially dangerous for cattle and horses, causing respiratory distress and organ damage

Common Germander

Teucrium chamaedrys

Moderate to high toxicity; linked to acute liver damage in both humans and animals when consumed regularly or in large quantities

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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.