When a 2-year-old female cat who was spayed at 5 months begins to show signs of heat, technically known as estrus, veterinarian Jeff Kahler explains the potential causes, including ectopic ovarian tissue or the unlikely possibility of ovarian tissue fragments inadvertently left behind during sterilization. Dr. Kahler recommends a veterinary exam and possibly tests to measure estrogen levels, which could signal whether exploratory surgery is warranted.

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