Star fruit is a toxic food for canines and should not be served as a dog treat under any circumstances. Star fruit contains soluble calcium oxalate crystals, which cause calcification and inflammation of the kidney. This can lead to kidney failure and death. 

Star fruit ingestion can produce many alarming symptoms in dogs. If your dog eats star fruit, they may experience the following symptoms: drooling, loss of appetite, vomiting, diarrhea, lethargy, tremors, excessive thirst or urination, rapid heart rate, bloody urine, and weakness. In rare cases, acute renal failure (also known as acute kidney failure) can occur. If you notice any of these symptoms on your dog, please contact your veterinarian immediately.
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