How long does a female cat’s first heat last?
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Expert Answer
A female cat’s first heat generally lasts 7 to 10 days. She starts around 6 months, with variation, and each heat lasts 7 to 10 days, returning every 2 to 3 weeks.
Signs include restlessness, frequent howling, low appetite and swollen vulva; if you do not plan to breed, spay after heat to lower reproductive disease and extend life.