I had one and when we got her we looked at her teeth and she had 3 rows of teeth! but was healthy. she was very hard to potty train the hardest of all my dogs and she wasnt really yappy but we had to get rid of her because my son was really young and i was afraid he would step on her or hurt her so a lady took her who's dog died of cancer.... She was about 3 pounds, they have different sizes the teacups and the regular they can range in size but i dont think they get much bigger than 10 to 12 pounds though.