Is Thyme Toxic to Cats and Dogs?
Thyme is listed as non-toxic for cats and dogs by the ASPCA. This means that if a pet chews on or eats a small amount of the fresh or dried herb, it is not expected to cause poisoning. The scientific name for common thyme is Thymus vulgaris.
While the plant itself does not contain any listed toxins for pets, this does not mean it should be a regular part of their diet. Any new food, including herbs and plants, can cause digestive issues if eaten, especially in large amounts. It is always best to supervise pets around any plants in the home or garden.
Thyme: what the ASPCA database lists
| ASPCA entry | Thyme |
|---|---|
| Other common names | Common Thyme, Garden Thyme, German Thyme |
| Scientific name | Thymus vulgaris |
| Family | Lamiaceae |
| Toxic to | None listed |
| Non-toxic to | Non-Toxic to Dogs, Non-Toxic to Cats, Non-Toxic to Horses |
| Toxic principles | Non-toxic |
| Clinical signs listed | None listed |
What the ASPCA says about thyme
The American Society for the Prevention of Cruelty to Animals (ASPCA) is a primary resource for pet poison control and plant safety. Its database lists thyme, also known as common thyme or garden thyme, as non-toxic to cats, dogs, and horses. This classification is based on the known properties of the plant and its typical effects on these animals. The ASPCA does not list any toxic principles or specific clinical signs of poisoning for Thymus vulgaris because it is considered a safe plant.
What this means for a home with pets
Having thyme in your home or garden is generally safe for cats and dogs. A curious pet that nibbles on a leaf is unlikely to experience a toxic reaction. You can grow it in an herb garden or keep a pot indoors without the same level of concern you might have for a plant known to be poisonous.
However, safety and diet are two different things. Thyme is not a part of a cat’s or dog’s natural diet, and their digestive systems are not designed to process large quantities of plant matter. Allowing a pet to eat a significant amount of any herb could lead to an upset stomach. It is always a good practice to keep plants out of easy reach and discourage pets from chewing on them, regardless of their toxicity status.
Points to consider with a non-toxic plant
Even safe plants like thyme can present some minor risks to pets. It is helpful to remember the following points of general pet safety:
- Digestive Upset: The most common issue with a pet eating any plant, even a non-toxic one, is gastrointestinal irritation. Eating an unusually large amount of thyme could lead to an upset stomach.
- Choking Hazard: Tough stems or a large mouthful of plant material could potentially pose a choking risk, particularly for smaller animals.
- Pesticides and Herbicides: If you are growing thyme outdoors or bringing it home from a store, be aware of any chemicals that may have been used on it. These substances can be harmful to pets even if the plant itself is safe.
- Individual Sensitivities: Just like people, some pets can have sensitivities or allergic reactions to things that are generally considered harmless. When introducing any new food item, it is wise to start with a very small amount and watch your pet for any unusual reactions.
When to call your vet
A non-toxic listing means the plant is not expected to poison pets, not that eating it is harmless. Call your vet if your pet shows any of the signs below after chewing on a plant.
If your pet has eaten a large amount of thyme and is showing signs of digestive distress, it is a good idea to call your veterinarian. For any urgent concerns about something your pet has ingested, contact your vet or the ASPCA Animal Poison Control Center immediately.
Emergency signs: go now
- Collapse, fainting or severe weakness
- Seizures, tremors or trouble standing
- Trouble breathing or blue, gray or very pale gums
- Repeated vomiting or retching, or a swollen, painful belly
- Any known contact with a substance listed as toxic, even before signs appear
Book an appointment soon
- Vomiting or diarrhea that lasts or keeps coming back
- Not eating or drinking, or drinking much more than usual
- Drooling, pawing at the mouth or a swollen face
- Lethargy, hiding or acting unlike themselves
ASPCA Animal Poison Control Center: (888) 426-4435 (a consultation fee may apply). Your own vet or nearest emergency clinic is always a good first call.
Sources
Last checked October 21, 2026. Listings and guidance can change; your veterinarian knows your pet’s health history.