This is why I let my son have my one female yorkie. He and his fiance work, plus she goes to school, and they didn't like leaving Teddy by himself, so, they asked for my little girl(his littermate). It was hard letting her go, but, my son and his fiance are so good to their little guy(treat him like royalty) so, I said give it a try. They fell in love with her, so, they kept her and I bought me a biewer. As littermates, they were always together(they were named Romeo and Juliet by the breeder)
If you can afford another one ,go for it..