Have the breeder test her for liver shunt before you decide on her. I have 2 tiny girls, one chihuahua 3 lbs. and Brooke is 3.8 lbs and they were quite tiny when they were infants. They just take more time to raise since they need to eat more. Bitsy had to be fed every 3 hours, 2 times a night at 2am and 5am, which went on until she was 5 months old!! Now she is just as healthy as her larger brothers and sisters!! Good luck with your decision but I love the little ones!!