My female cat was spayed approximately two years ago. The fur on the area that was shaved for surgery has never grown back. There is a layer of soft downy fuzz, but nothing more. The demarcation between where she was shaved and where she wasn't is absolutely clear. It's as if she has an "inverse Brazilian"!
I will of course ask the vet about this when I take her for her annual exam, but in the meantime I'm curious about why this might be. She doesn't groom the area excessively, and her skin and the rest of her coat are in excellent condition. The area is not sensitive or tender -- she loves getting belly rubs. She's happy, relaxed, playful, and the picture of health. I feed both of my cats Royal Canin Sensitive (because my other cat can get stressed easily). Is this just one of those things that happens to some cats?