Zoe is about 5.5 pounds right now. There are definately some days that I look at her and freak a bit at how small she is! I totally worry about her all the time! She's not the smartest so sometimes she'll just be ... not smart 

 and get hurt, but so far it's been very minor things. 

 Like she runs to me as I'm walking over something and runs in to my foot coming down.... (or shifting to get comfy and rolling herself off the couch! A minor thud, once a small yelp, and no damage done....) 
 
All the same I know I worry!