Hello and Welcome to YT!!
I don't have an answer to your question. I just wanted to tell you how sorry I am about the loss of your Riley. He will be waiting for you across the Rainbow Bridge. I think that it is wonderful that you have room in your heart for another yorkie. It will not replace Riley, but will be loved by you and return your love ten fold. He/she will help your heart to heal. My God guide you to a great breeder and may He heal your heart. Rest In Peace, Riley!