Georgie is small he is 3 1/2 at 1yr, and thank God we haven't had any problems. The biggest problem we had was diarrhea a couple of time, but our big Boxer has had that too. Georgie is awesome what he lacks in size he makes up for in attitude
I will tell you a couple of things I have learned:
1.) Make sure they eat even if they are picky eaters find something they like, because they are so small and have no reserves.
2.) Don't let people especially children pick them up unless you are right there with them.
3.) Watch them when they are outside big birds can mistake them for squirrels and try to hurt them.
Sorry if all the above in common sense I can tell you that these are things I was unaware of and have learned about over the 9 months Georgie has been with me. good luck and please post pics soon