i would never breed my female that many times and back to back. maybe it is for money
my yorkie had her first litter at 2 on her 3rd heat and then 4 heats and 1 1/2 yrs later she should be pregnant again now . after this i doubt ill breed her again i think 2 times is enough for her shes 4 1/2 lbs and going to be 4 in december. Last time pregnancy was perfect no nausea vomiting or diarrhea even after eating everything she she was in labor. she did so good, last litter went to family member, this time im keeping them except one will go to my mom.