Is Basil Toxic to Cats and Dogs?
Basil is considered non-toxic for both cats and dogs. The American Society for the Prevention of Cruelty to Animals (ASPCA) includes basil on its list of plants that are safe for these pets.
While the plant itself is not poisonous, this does not mean it can be eaten in large quantities without any risk of digestive upset. As with any food item, moderation and careful introduction are important for pet safety.
Basil: what the ASPCA database lists
| ASPCA entry | Basil |
|---|---|
| Other common names | Saint Joseph’s Wort, Thai Basil, Sweet Basil |
| Scientific name | Ocimum basilicum |
| Family | Lamiacea |
| Toxic to | None listed |
| Non-toxic to | Non-Toxic to Dogs, Non-Toxic to Cats |
| Toxic principles | None listed |
| Clinical signs listed | None listed |
ASPCA’s listing for basil
The ASPCA plant database identifies basil, known scientifically as Ocimum basilicum, as non-toxic to cats and non-toxic to dogs. The organization does not list any toxic principles or specific clinical signs of poisoning associated with this plant. Other common names for this herb include Saint Joseph’s Wort, Thai Basil, and Sweet Basil.
This classification means that accidental ingestion of a small amount of the basil plant is not expected to cause a toxic reaction in a healthy cat or dog. The listing applies to the plant itself, which is a member of the Lamiacea family.
What this means in a home with pets
Having a basil plant in your home or garden is generally safe around cats and dogs. If a curious pet chews on a leaf, it is not a cause for immediate alarm about poisoning. Many pets may show no interest in the plant at all, while others might be drawn to its scent.
However, it is always a good practice to supervise pets around any houseplant, even non-toxic ones. This helps prevent them from eating large amounts of plant matter, which can lead to other issues. Keeping plants in areas that are not easily accessible can discourage unwanted nibbling and ensure your pet does not acquire a taste for eating greenery that is not part of its regular diet.
Points to consider with a non-toxic plant
Even safe plants like basil can cause problems if a pet eats too much. Consuming a large volume of any plant material can lead to stomach upset, vomiting, or diarrhea. Pets have digestive systems that are not designed to process large quantities of fibrous plants.
Consider these general safety guidelines:
- Individual sensitivities: Any new food can potentially cause an allergic reaction or digestive issue in a sensitive pet. Introduce new items slowly and in very small amounts.
- Pesticides and chemicals: Ensure any basil plant your pet might access is free from pesticides, herbicides, or other chemicals that could be harmful if ingested.
- Choking hazard: Thick stems or large quantities of leaves could pose a choking risk, particularly for small animals or pets that eat quickly without chewing properly.
- Added ingredients: Basil is often used in foods with other ingredients, like garlic and onions, which are toxic to pets. Only offer plain basil, and always read ingredient labels on any human food product.
Consulting a veterinarian before adding new foods to your pet’s diet is always the safest approach.
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 eats a large amount of basil or shows signs of digestive upset like vomiting or diarrhea, it is best to contact your veterinarian. For any urgent concerns about something your pet has ingested, call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435. A consultation fee may apply. Have the plant name and any product packaging available for reference.
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.