I was in a similar situation as you...I had a male and I wanted another yorkie, a female, so Hobbs would have a playmate. We contacted Hobbs' breeder and put a deposit on a female that was from Hobbs same parents. After we put down our deposit, I started feeling very apprehensive about bringing another yorkie into our home because everything seemed to be going SO well. We brought Hootie home when Hobbs was 8 months old. It took Hobbs a good week to get used to Hootie, but now we've had Hootie for 5 months and she and Hobbs are INSEPARABLE!! They keep each other company, they are the best playmates, and they love each other to death. It is not any harder having 2 than just having one. The one and only drawback that I can possibly think of is the financial aspect of paying vet bills for 2 dogs. But that is slight compared to all the wonderful positives that come with having 2+ yorkies. I know you will not regret it one bit.