I've attempted to do some reading on spay and neutering practices. It seemed to me that if people have health concerns when hormones are out of balance, completely desexing a dog would also have negative consequences. I found some pretty mixed things and it seems you can find things to support whatever stance you want to take. It seems, however, that newer research is starting to support either later spay or ovary sparing spay. I'm looking at getting a female when I get a dog and I'm considering whether to get an ovary sparing spay or spay on the later side. Ovary sparing spay would mean dealing with heat cycles but no blood whereas late spay would mean heat cycles with blood for a number of years followed by no heat cycles. I'm not sure if one or the other is better for the dog or if it's about equal.