# Can Cats Eat Parsley? Furocoumarin Phototoxicity ## Key Takeaways - Parsley contains furocoumarins, which are phototoxic compounds that can cause severe skin reactions (phytophotodermatitis) in cats when exposed to UV-A light after ingestion or skin contact. - Clinical signs of furocoumarin phototoxicity include erythema, edema, blistering, and potential epidermal sloughing, primarily affecting depigmented or sparsely furred areas like the ears, nose, and lips, typically appearing 24-48 hours post-exposure. - Ingestion of moderate to large quantities of parsley can also lead to gastrointestinal upset, including vomiting, diarrhea, and abdominal pain, with potential for uterine stimulation in pregnant animals. - Risk factors for phototoxicity include the amount of parsley consumed, direct skin contact with parsley juice, reduced fur density or light coat color, and significant sun exposure. - Management is supportive, involving decontamination (if recent ingestion), symptomatic skin care (topical corticosteroids, pain management), gastrointestinal support, and strict avoidance of sunlight for at least 48 hours post-exposure. - Safe alternatives for cats that ingest plant material include commercially available cat grass (e.g., wheatgrass, oat grass) or catnip, while parsley and other furocoumarin-containing plants (celery, parsnips, figs) should be kept inaccessible. --- The short answer is no. Cats should not eat parsley. While a small nibble of the leafy top may pass without incident, parsley contains natural compounds called furocoumarins. These compounds can cause a serious skin reaction called phototoxicity when they contact a [cat](/knowledge/veterinary-medicine/clinical-methods/cat)'s skin and are then exposed to sunlight. Ingesting large amounts can also lead to gastrointestinal upset or more severe systemic effects. If your cat has eaten parsley, especially in quantity, contact your veterinarian or a pet poison control center immediately. **Owner Triage Summary** - **Small taste (one leaf or less):** Monitor for vomiting, diarrhea (or diarrhoea), or lethargy. Most cats will not show signs. - **Moderate amount (a few leaves or a teaspoon of chopped parsley):** Call your veterinarian for advice. Watch for skin redness, especially on the ears, nose, or lips, if the cat has been in the sun. - **Large amount (a tablespoon or more, or any concentrated parsley product):** Seek veterinary care right away. Do not wait for signs to appear. - **Any skin contact with parsley juice followed by sun exposure:** Wash the area with mild soap and water, keep the cat indoors, and call your veterinarian. This article explains the science behind parsley's danger to cats, what furocoumarin phototoxicity looks like, and what to do if your cat is exposed. ## At a Glance: Parsley Toxicity in Cats | Factor | Details | |, - |, - | | **Common name** | Parsley (garden parsley, curly-leaf parsley, Italian flat-leaf parsley) | | **Scientific name** | *Petroselinum crispum* | | **Toxic principle** | Furocoumarins (psoralens, bergapten, xanthotoxin) | | **Toxic parts** | All parts, but highest concentration in leaves and seeds | | **Main risk** | Phototoxicity (skin reaction after sun exposure) | | **Gastrointestinal risk** | Vomiting, diarrhea (diarrhoea), abdominal pain | | **Other risks** | Uterine stimulation in pregnant animals; possible kidney effects in large doses | | **Onset of signs** | Skin signs within 24 to 48 hours after sun exposure; GI signs within hours | | **Prognosis** | Good with prompt treatment; skin lesions may take weeks to heal | | **Safe alternative** | Cat grass (wheatgrass, oat grass) or catnip | ## What Are Furocoumarins? Furocoumarins are a group of naturally occurring chemical compounds found in several plant families. They are part of a larger class of molecules called psoralens. These compounds are produced by plants as a defense mechanism against insects, fungi, and grazing animals. Parsley, celery, parsnips, figs, and giant hogweed all contain furocoumarins. In humans, contact with these plants followed by sun exposure can cause a condition called phytophotodermatitis. The same mechanism applies to cats, though their fur often provides some protection. Furocoumarins are phototoxic. This means they are not harmful on their own, but they become dangerous when the skin is exposed to ultraviolet (UV) light. When UV-A rays hit a furocoumarin molecule that has been absorbed into the skin, the molecule becomes excited and causes damage to cellular DNA and cell membranes. This triggers an inflammatory response that leads to redness, blistering, and pain. ## How Furocoumarin Phototoxicity Works in Cats To understand why parsley is risky for cats, it helps to know how the reaction unfolds. 1. **Exposure:** A cat chews on parsley leaves, or parsley juice gets on the skin. The furocoumarins are absorbed into the epidermal cells. 2. **Sunlight:** The cat goes outside or lies in a sunny window. UV-A radiation penetrates the skin and activates the furocoumarins. 3. **Cellular damage:** The activated furocoumarins bind to DNA and cause cross-linking, which damages the cells and triggers an inflammatory cascade. 4. **Clinical signs:** Within 24 to 48 hours, the affected skin becomes red, swollen, and painful. Blisters may form. In severe cases, the skin can slough off. The reaction is limited to areas of skin that were exposed to both the plant material and sunlight. In cats, the ears, nose, lips, and abdomen are most commonly affected because these areas have less fur. ## Can Cats Eat Parsley? The Direct Answer No, cats should not eat parsley. The Pet Poison Helpline and veterinary toxicology resources classify parsley as a plant that can cause photosensitization in cats. While the leaves are not as toxic as some other plants, the risk is not worth taking. There are several reasons why parsley is not safe for cats: - **Phototoxicity:** The furocoumarins in parsley can cause severe skin reactions when combined with sun exposure. - **Gastrointestinal upset:** Ingesting a moderate amount can cause vomiting, diarrhea (diarrhoea), and abdominal pain. - **Uterine effects:** Parsley has been used traditionally as an emmenagogue, a substance that stimulates menstrual flow. In pregnant animals, it can potentially cause uterine contractions, which may lead to miscarriage or premature labor. - **Kidney concerns:** Large amounts of parsley contain compounds that may irritate the kidneys, though this is more of a concern with concentrated extracts or essential oils. Some commercial [cat treats](/knowledge/veterinary-medicine/clinical-methods/cat-treats) and foods contain parsley. These products use very small amounts that are processed in ways that reduce the furocoumarin content. However, this does not mean that fresh parsley from your garden or kitchen is safe for your cat. ## Causes and Differentials: Why Would a Cat Eat Parsley? Cats are obligate carnivores, meaning their natural diet consists almost entirely of meat. However, cats do sometimes eat plant material. This behavior is normal and serves several purposes. - **Fiber for digestion:** Cats may eat grass or other plants to help move hairballs through their digestive tract. - **Exploration:** Kittens and curious adult cats often mouth or chew on new objects, including plants. - **Taste:** Some cats simply like the taste or texture of certain herbs. - **Pica:** In some cases, eating non-food items can indicate a medical or behavioral issue, such as anemia, nutritional deficiency, or stress. If your cat is eating parsley, it is worth discussing with your veterinarian. They may recommend providing safe alternatives like cat grass, which is specifically grown for cats to nibble on. ## Risk Factors for Furocoumarin Phototoxicity in Cats Not every cat that eats parsley will develop phototoxicity. Several factors influence the severity of the reaction. ### Amount of Parsley Consumed The more parsley a cat eats, the more furocoumarins are absorbed into the body. A single leaf may cause no signs at all, while a large quantity can cause significant illness. ### Skin Exposure Cats that get parsley juice on their skin and then go into the sun are at higher risk for phototoxicity. This can happen if a cat chews on a parsley stem and the juice drips onto the chin or chest. ### Coat Color and Fur Density Cats with white or light-colored fur and pink skin are more susceptible to sun damage in general. Their skin has less melanin, which provides some natural protection against UV radiation. A cat with thick, dark fur is less likely to have parsley juice reach the skin. ### Sun Exposure The phototoxic reaction requires UV-A light. Cats that are strictly indoor and do not have access to sunny windows may not develop skin signs, even if they ingest parsley. However, UV-A rays can penetrate glass, so a cat lying in a sunny window after eating parsley is still at risk. ### Individual Sensitivity Some cats are more sensitive to furocoumarins than others. There is no way to predict which cats will have a severe reaction. ## Veterinary Examination and Diagnostics If you bring your cat to the veterinarian for suspected parsley ingestion, the veterinarian will perform a thorough examination and may recommend diagnostic tests. ### History and Physical Examination The veterinarian will ask about: - What your cat ate and how much - When the ingestion occurred - Whether your cat has been exposed to sunlight - Any signs you have noticed at home During the physical exam, the veterinarian will look for: - Redness or swelling on the skin, especially on the ears, nose, lips, and abdomen - Blisters or ulcers in the mouth or on the skin - Signs of dehydration or abdominal pain - Changes in heart rate or respiratory rate ### Diagnostic Tests In most cases, the diagnosis is based on the history and physical exam. However, the veterinarian may recommend blood work to check organ function, especially if your cat ingested a large amount of parsley. - **Complete blood count (CBC):** This test checks for signs of infection or inflammation. - **Biochemistry panel:** This test evaluates kidney and liver function, as well as electrolyte balance. - **Urinalysis:** This test can detect kidney irritation or damage. These tests are not specific for parsley toxicity, but they help rule out other causes of the clinical signs and assess the overall health of your cat. ## Evidence-Based Management of Parsley Toxicity in Cats There is no specific antidote for furocoumarin toxicity. Treatment is supportive and focuses on managing clinical signs and preventing further absorption of the toxins. ### Decontamination If the ingestion occurred within the last few hours and the cat is not showing signs, the veterinarian may induce vomiting. This should only be done by a veterinarian. Never induce vomiting at home without specific instructions, as it can cause aspiration or worsen the situation. Activated charcoal may be given to bind any remaining furocoumarins in the gastrointestinal tract. However, this is only effective if given soon after ingestion. ### Skin Care If the cat has parsley juice on the skin, the area should be washed immediately with mild dish soap and lukewarm water. This removes the furocoumarins before they are fully absorbed. The cat should be kept indoors and out of direct sunlight for at least 48 hours after exposure. This prevents the phototoxic reaction from occurring. If skin lesions have already developed, the veterinarian may prescribe: - Topical corticosteroids to reduce inflammation - Antibiotics if there is a secondary bacterial infection - Pain medication to keep the cat comfortable ### Gastrointestinal Support For cats with vomiting or diarrhea (diarrhoea), the veterinarian may recommend: - Withholding food for 12 to 24 hours to rest the stomach - Offering small amounts of water frequently to prevent dehydration - A bland diet, such as boiled chicken and rice, once vomiting has stopped - Anti-nausea medication, such as maropitant (Cerenia), if vomiting is severe ### Monitoring Cats with mild exposure may not require hospitalization. The veterinarian will give you instructions for monitoring at home and ask you to call if signs worsen. Cats with severe signs, such as extensive skin lesions, dehydration, or kidney issues, may need to be hospitalized for intravenous fluids and supportive care. ## Unsafe Home Remedies to Avoid When your cat eats something it should not, your first instinct may be to try home remedies. Some of these can be harmful. - **Do not induce vomiting with hydrogen peroxide.** This can cause severe stomach irritation and aspiration pneumonia. Only a veterinarian should induce vomiting. - **Do not give milk.** Many cats are lactose intolerant, and milk can worsen gastrointestinal upset. - **Do not apply human skin creams to your cat.** Corticosteroid creams meant for humans may be too strong and can be toxic if the cat licks them off. - **Do not use essential oils.** Parsley essential oil is highly concentrated and much more toxic than the fresh herb. Essential oils should never be given to cats. - **Do not wait to see if signs develop.** If your cat ate a large amount of parsley, seek veterinary care immediately. ## Prevention: Keeping Your Cat Safe from Parsley The best way to prevent parsley toxicity is to keep parsley out of your cat's reach. - **Keep parsley in a closed cabinet or refrigerator.** Do not leave it on the counter where a curious cat can reach it. - **Do not grow parsley as a houseplant.** If you have an outdoor garden, consider fencing off the parsley or growing it in a hanging basket that cats cannot access. - **Check the ingredients in commercial cat foods and treats.** Some products contain parsley as a flavoring. These are generally safe in the amounts used, but if you have concerns, talk to your veterinarian. - **Provide safe alternatives.** Cats that like to chew on plants should be offered cat grass, which is typically a mix of wheat, oat, or barley grass. These are safe for cats to nibble on and provide fiber that aids digestion. - **Be aware of other furocoumarin-containing plants.** Celery, parsnips, figs, and giant hogweed also contain furocoumarins. Keep these away from your cat as well. ## Prognosis for Cats with Parsley Toxicity The prognosis for cats with parsley toxicity is generally good, especially with prompt treatment. - Cats that ingest a small amount and do not develop signs will recover without treatment. - Cats that develop phototoxicity will recover, but skin lesions may take several weeks to heal. In severe cases, there may be permanent scarring or changes in skin pigmentation. - Cats that develop kidney issues from a large ingestion have a more guarded prognosis, but this is rare. The key to a good outcome is early intervention. If you suspect your cat has eaten parsley, contact your veterinarian right away. ## Regional Considerations for Pet Owners The risk of parsley toxicity varies by region, mainly due to differences in sun exposure. - **United States and Canada:** Sun exposure is seasonal in many areas. Phototoxicity is more likely to occur in the spring and summer months when UV radiation is strongest. Cats in southern states or provinces may be at risk year-round. - **Europe:** Similar to North America, the risk is highest in the summer. In northern European countries, the risk is lower due to weaker UV radiation. - **Australia:** Australia has high levels of UV radiation year-round. Cats in Australia are at higher risk for phototoxicity from furocoumarin-containing plants. The Australian Veterinary Association emphasizes the importance of sun safety for pets, including keeping cats indoors during peak UV hours. Regardless of where you live, the safest approach is to keep parsley and other furocoumarin-containing plants away from your cat. ## The Role of Veterinary Organizations in Pet Safety Veterinary organizations around the world provide guidance on pet safety and toxicology. - **The American Veterinary Medical Association (AVMA)** provides resources for pet owners on common household hazards, including toxic plants. They recommend that pet owners be aware of the plants in and around their homes and know the signs of poisoning. - **The American Animal Hospital Association (AAHA)** publishes guidelines for preventive care, which include discussions about nutrition and environmental safety. Regular wellness visits are an opportunity to ask your veterinarian about safe and unsafe plants for your pet. - **The Canadian Veterinary Medical Association (CVMA)** and the **Canadian Food Inspection Agency (CFIA)** provide information on animal health and safety. They encourage pet owners to consult their veterinarian before introducing new foods or plants into their pet's environment. - **The Federation of Veterinarians of Europe (FVE)** and the **European Food Safety Authority (EFSA)** work to ensure the safety of animal feed and food products. While they do not specifically regulate home gardens, their guidelines on plant safety inform veterinary practice across Europe. These organizations do not specifically endorse or prohibit parsley for cats, but their general guidelines on plant safety and preventive care are relevant. Your veterinarian is the best source of information for your individual cat. ## Limitations and When to Contact a Veterinarian This article provides general information about parsley toxicity in cats. It is not a substitute for professional veterinary advice. There is significant individual variation in how cats respond to parsley. Factors such as the cat's age, health status, and the exact amount of parsley consumed can all influence the outcome. Breed-level information cannot predict how a specific cat will react. Contact your veterinarian immediately if: - Your cat ate a large amount of parsley. - Your cat is vomiting, has diarrhea (diarrhoea), or seems lethargic. - You notice redness, swelling, or blisters on your cat's skin. - Your cat is pregnant. - Your cat has a pre-existing medical condition, such as kidney disease. If your regular veterinarian is closed, contact an emergency veterinary clinic or a pet poison control hotline. In the United States, the ASPCA Animal Poison Control Center (888-426-4435) is available 24 hours a day. In Canada, contact your local veterinary emergency clinic. In Europe and Australia, similar services are available through veterinary associations and emergency hospitals. ## Frequently Asked Questions ### 1. Is a small piece of parsley toxic to a cat? A single small piece of parsley is unlikely to cause serious toxicity, but it can still cause mild gastrointestinal upset in some cats. The main concern is furocoumarin phototoxicity, which requires sun exposure to trigger a skin reaction. If your cat ate a small piece, monitor for signs and contact your veterinarian if you have concerns. ### 2. What are the signs of furocoumarin phototoxicity in cats? Signs include redness, swelling, and blistering of the skin, usually on the ears, nose, lips, or abdomen. These signs typically appear 24 to 48 hours after exposure to sunlight. The affected areas may be painful, and the cat may lick or scratch at them. ### 3. Can cats eat cooked parsley? Cooking does not completely destroy furocoumarins. While it may reduce the concentration, cooked parsley can still cause the same adverse effects. It is safest to avoid giving parsley to your cat in any form. ### 4. Why do some commercial cat foods contain parsley? Parsley is sometimes added to commercial cat foods as a source of chlorophyll, which may help with breath odor, or as a natural preservative. The amounts used are very small and are generally considered safe. However, this does not mean that fresh parsley is safe for cats. ### 5. What should I do if my cat licks parsley juice off my hands? Wash the area of your cat's skin that came into contact with the juice using mild soap and water. Keep your cat indoors and out of direct sunlight for 48 hours. Monitor for any signs of skin irritation. If any redness or swelling develops, contact your veterinarian. ### 6. Are there any safe herbs for cats? Yes, some herbs are safe for cats in small amounts. Catnip and cat thyme are safe and enjoyable for many cats. Others, such as basil, dill, and rosemary, are generally considered safe in tiny amounts, but you should always check with your veterinarian before offering any new food to your cat. ### 7. Can parsley cause kidney failure in cats? Large amounts of parsley can irritate the kidneys, but kidney failure is rare and typically only occurs with ingestion of very large quantities or concentrated extracts. The more common and immediate concern is gastrointestinal upset and phototoxicity. ### 8. Is parsley essential oil safe for cats? No. Parsley essential oil is highly concentrated and much more toxic than the fresh herb. It can cause severe gastrointestinal distress, liver damage, and even death. Essential oils should never be given to cats, either orally or topically. ## Related Clinical & Scientific Guides * [Can Dogs Eat Spinach? Oxalic Acid & Kidney Warnings](/knowledge/veterinary-medicine/toxicology-food-safety/can-dogs-eat-spinach-oxalic-acid-kidney-warnings) * [Can Cats Eat Broccoli? Isothiocyanate and Gas Production](/knowledge/veterinary-medicine/toxicology-food-safety/can-cats-eat-broccoli-isothiocyanate-and-gas-production) * [Can Cats Eat Raw Egg Whites? 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