Normally, the white blood cells of a cat will not decrease when it is frightened, but it may cause the cat to have a stress response and cause symptoms such as decreased appetite, diarrhea, and vomiting. The symptoms are relatively mild and can recover in about 1 to 2 days.

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Generally, the cause of leukopenia is viral infection, such as feline panleukopenia, feline leukemia, feline infectious peritonitis, etc. In addition, damage to hematopoietic function can also lead to a decrease in the number of white blood cells.