Ovarian Remnant Syndrome
This condition occurs if any ovarian tissue is left behind during a standard spay surgery. The best evidence is a cat who is spayed — but displays signs of estrus.
Recently, at my cats-only veterinary hospital, I examined a young female cat that had been adopted a few months before from a local rescue organization. The owner brought her in for behavioral issues. “She’s been making trilling noises, and she sticks her rear end in the air, and is rolling around on the carpet all squirmy,” explained her concerned owner. “She’s also become extremely affectionate,” she said. “But the trilling and meowing at night is driving us crazy!”