Your little sister should know not to play rough with them like that and especially when you are gone, she is very young though so i know sometimes they don't listen

That is the reason i stopped leaving my babies at my bf's house, he has a 6 yr old niece and if i were not there she would pick them up, all 3 of them and it's very frustrating. I have never left Sophie there, w/o me being there, it's been that long since i've ever left them there alone and when i did it was only for like 2 hrs. Her mom does not discipline her at all, it's annoying. Anyway i def. think a young child like that should know that Yorkies are fragile and not to play with them and pick them up. Best of luck! And im sorry you had a bad weekend