Is Parsley Toxic to Cats and Dogs?
Parsley (Petroselinum crispum) is toxic to cats and dogs according to the ASPCA. The plant contains compounds that can cause a specific reaction related to sun exposure if a pet eats a large quantity of it.
While many people use small amounts of the herb in cooking, the entire plant, including the leaves, stems, and roots, contains toxic principles. The risk to pets is related to the amount consumed. A small nibble is very different from a pet eating an entire bunch from the garden or countertop.
Parsley: what the ASPCA database lists
| ASPCA entry | Parsley |
|---|---|
| Other common names | Italian Parsley, Hamburg Parsley, Turnip-rooted Parsley |
| Scientific name | Petroselinum crispum |
| Family | Apiaceae |
| Toxic to | Toxic to Dogs, Toxic to Cats, Toxic to Horses |
| Non-toxic to | None listed |
| Toxic principles | Furanocoumarins |
| Clinical signs listed | Photosensitization (sunburn, dermatitis), large amounts are needed to cause this effect |
What the ASPCA says about parsley
The American Society for the Prevention of Cruelty to Animals (ASPCA) lists parsley as toxic to cats, dogs, and horses. This applies to the plant also known by other common names, including Italian Parsley, Hamburg Parsley, and Turnip-rooted Parsley.
The toxic principles in parsley are identified as furanocoumarins. The main clinical sign associated with the ingestion of large amounts of this plant is photosensitization. This is a condition where the skin becomes abnormally sensitive to sunlight, which can lead to severe sunburn or dermatitis. The ASPCA specifies that a pet would need to consume a large quantity of parsley for these effects to occur.
What this means in a home with pets
Having parsley in your home or garden requires careful management if you have pets. While a tiny leaf dropped on the floor is unlikely to cause a problem, the main concern is a cat or dog gaining access to and eating a significant portion of the plant. This could happen with parsley grown in an herb garden, a pot on a windowsill, or a bunch left on a kitchen counter during meal preparation.
The risk of photosensitization means that if a pet eats a large amount of parsley, its skin could have a severe reaction to sun exposure. This is not a typical allergic reaction but a specific chemical light-induced sensitivity. Supervising pets, especially curious cats and dogs known for chewing on plants, is a key part of preventing accidental ingestion.
Keeping cats, dogs, and this plant apart
The simplest way to prevent parsley poisoning is to make the plant inaccessible to your pets. This is a standard safety practice for any potentially harmful plant or food item.
- For indoor plants, place them on high shelves or in rooms that your pets cannot enter.
- In an outdoor garden, consider using fencing or netting to create a barrier around your herb patch. You could also use raised garden beds that are too high for your dog to reach easily.
- When cooking with fresh parsley, keep it out of your pet’s reach. Clean up any dropped leaves or stems promptly so a curious cat or dog does not have a chance to eat them.
Always supervise your pets, especially when introducing new plants into your home or garden environment. Diligence is the most effective tool for keeping them safe.
When to call your vet
If your pet chewed or ate part of this plant, call your veterinarian or an animal poison control line. Note which plant and which part, how much may be gone and when, and take a photo or a piece of the plant with you.
If you suspect your pet has eaten a large amount of parsley, contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately. A consultation fee may apply. Note the time of ingestion and how much of the plant you believe was consumed. Do not try to induce vomiting or give any home remedies unless specifically instructed to do so by a veterinary professional.
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.