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Citrus
Citrus spp.
Citrus plants, including oranges, lemons, limes, grapefruits, and related species, can be harmful to cats in many forms. This includes the fruit, peel, leaves, and stems. The main problem comes from citric acid and concentrated citrus oils. One important compound is D-limonene, which is found in higher amounts in citrus peel and oils. These substances can irritate a cat’s stomach, skin, and breathing passages. If a cat is exposed to a large enough amount, the oils may also affect the nervous system and cause weakness, depression, or other serious symptoms. The peel, leaves, and stems usually contain the highest levels of toxic oils, so they are more dangerous than the fruit flesh. The flesh itself is usually less risky, but its acidity can still cause mild digestive upset, such as vomiting, diarrhea, or drooling. Cats should not be allowed to eat citrus fruits or chew on citrus plants.
Important Notes
Symptoms (mild): Vomiting and diarrhea from eating a small piece of fruit.
Symptoms (severe): Drooling, skin irritation, respiratory distress, low blood pressure, muscle tremors, and CNS depression from contact with peels, leaves, or essential oil products.
Peels are the greatest danger: Citrus peel contains the highest concentration of D-limonene. Citrus-based cleaning products and essential oil diffusers can also expose cats through inhalation.
Deterrent note: Most cats naturally dislike the smell of citrus, but inquisitive cats or those with access to fallen fruit should be monitored.
Potentially Toxic Parts
Stem
Leaf
Seed
Fruit
Peel
Possible Symptoms Reported in Cats
Seizures and collapse
Neurological
Liver failure (Hepatic necrosis)
Hepatic
CNS Depression (Lethargy, dullness, weakness)
Neurological
Tremors, shaking, and ataxia (walking as if drunk)
Neurological
Soreness, redness, or chemical burns
Dermal · Rapid (upon contact).
Vomiting and diarrhea (Gastrointestinal irritation)
Gastrointestinal
Excessive dribbling or drooling
Gastrointestinal · Rapid (often a response to taste or oral irritation).
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.