[Yorkieluv]

Our yorkie is also our little spoiled baby, so we had the same thought process as you regarding whether or not he would actually want another dog in the house. He love other dogs so much that we thought he would like it though. I think for the first couple of weeks your baby may feel confused and might even avoid the new addition, but once he gets used to it, he will love having a brother/sister. Our yorkie was almost 3 yrs old when we decided to get Emma, and he accepted her completely. She was 7 months old when we got her, so she wasn't going through those crazy puppy stages. I think that might have helped too.
Our yorkie is not less attached to us by any means. He still loves to give us kisses, bring us toys to play fetch with, sleep with us, cuddle, etc. Nothing really has changed for him, except that now he has another dog to play with as well. Our other dog, Emma is just like him.
Now instead of just having one dog laying on our heads at night, we have two. Instead of playing fetch with one, we have two, and same thing with cuddling. I have two dogs on my lap when I'm on the couch. They cuddle with each other on top of us.