my baby milu is also very small, she is almost 8 months old and she is 2.6 lbs. i was worried about her health for a long time as well, but she seems very healthy. my vet always assured me that she is a healthy dog and not to worry about her small size. the only frustration i have now is bed time, i can't sleep well, because i am worried that i will crush her, and she is spoiled and won't sleep in her own bed