I have been lucky so far (knock on wood) With Diezel not having any serious health problems.. I am just neurotic and always go to the VET. So I would have to say when it comes to these tiny ones its more injury that you should worry about. Diezel once jumped from my friends hands from about only a foot or so high (same height as the couch) and he dislocated his elbow.
You really just have to watch doors before you close them and not allow to jump off couch or the edge of the bed.
Diezel like the dog he is likes to climb to the highest mountain so Since he chooses to sit on the top back part of the couch I have actually gotten somethign to keep behind it and on the side so incase he slides off...lol And it helped with my storage too