✕ Toxic

Citrus fruits (oranges, tangerines, lemons, pomelos)

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 (from peel/leaves): Drooling, vomiting, skin irritation, respiratory distress, and CNS depression in significant exposures.

Symptoms (from flesh only): Mild vomiting and diarrhea from the acidity.

Peels are the greatest hazard: Citrus peel concentrates D-limonene — this is also why citrus-scented cleaning products and essential oils pose a risk even without direct plant contact.

Deterrent note: Most cats dislike the scent of citrus — this aversion can be useful for deterring cats from certain areas.

Potentially Toxic Parts

Stem

Peel

Juice

Skin

Flesh

Fruit

Possible Symptoms Reported in Cats

Vomiting, Diarrhea, and Stomach Upset

Gastrointestinal · Shortly after ingestion (exact timeframe is not specified in the sources,

Central Nervous System (CNS) Depression

Neurological · Variable (develops as the toxins are absorbed systemically).

Skin Irritation and Allergic Reactions

Dermal · Shortly following direct physical contact.

Respiratory Tract Irritation

Respiratory · Immediate upon inhalation/exposure.

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.