Cats cannot eat oranges. Oranges and other citrus fruits contain toxic compounds such as essential oils (limonene and linalool), psoralens, and citric acid that are harmful to cats. Additionally, the high sugar content in oranges is not suitable for cats, as their bodies are optimized for a high- protein, low-carbohydrate diet. Oranges can cause gastrointestinal upset, skin irritation, vomiting, diarrhea, and even more severe health issues if ingested by cats. The peel and seeds are especially dangerous due to concentrated toxins and the risk of choking or gastrointestinal blockage. Cats generally dislike the smell of citrus fruits and typically avoid them naturally, but it is best to prevent any consumption and contact a veterinarian immediately if ingestion occurs.