I agree about the healthy eating bit. Not sure making doctors appointments on each others behalf is helpful though. My master has taken some control of my fitness schedule. He instructs me on how far to run, that kind of thing. I find it pushes me further than I would have otherwise gone. In that respect, he is improving my health. He also dosen't let me eat a lot of crap, which is also good. It's an excellent way to be controlled as it's so healthy, and when you really want a piece of chocolate it can be denied to you or given, depending on your Master's wishes. Consider that all you chocoholics out there!
My Master is very healthy anyway. If he wasn't, I'm not sure what I'd do. Possibly I wouldn't be with him because it's important to me to be fit and healthy. I wouldn't feel at all happy controlling his diet, it should be the other way around.