Parsley contains furanocoumarins, compounds that can cause photosensitization — a sunburn-like skin reaction — in cats. Meaningful quantities are generally needed to trigger this, so a cat nibbling a sprig or two isn't likely to have a problem, but parsley isn't something to offer regularly or in any quantity.
Keep any parsley offered to a small, occasional garnish-sized amount, and make sure it's culinary parsley (Petroselinum crispum) rather than a lookalike plant.
Parsley contains furanocoumarins, which can cause photosensitization (a sunburn-like skin reaction) in cats, though it typically takes a substantial amount to cause a problem. A small taste now and then isn't cause for alarm, but it's not a food to offer freely or often.
Fresh curly parsley is the better choice, and only in very small amounts. Dried products from the spice rack may be mixed with seasoning, so they are best avoided.
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Pet poison hotlines (24/7, US and Canada):
ASPCA Animal Poison Control Center: (888) 426-4435
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Pet Poison Helpline: (855) 764-7661
Pet Poison Helpline states its service covers the U.S., Canada and the Caribbean. The ASPCA line is also used by Canadian pet owners. A consultation fee may apply to both. In Canada, your nearest 24-hour emergency vet clinic is the best first call; elsewhere, use local emergency veterinary directories.
How we calculate results: This tool uses commonly referenced veterinary toxicity thresholds and food safety guidelines. Actual toxicity can vary based on your pet's size, health status, and exact substance consumed. These results are estimates only and do not replace a veterinary assessment.