like everyone has said.. it all varies.. plus, you're taking into consideration that this is a tiny dog.. you will be more worried if they jump off of something the wrong way.. if it starts coughing in a weird way (which could be just a regular cough or something more serious).. if they have weird colored poo.. which most of the time is nothing..
there's just so much more with the smaller breeds you don't consider.. I know for a fact I didn't...
but they get you so hooked on the breed