Hi, I'm getting a yorkie puppy soon

and have been researching on them for about 2 years now. I'm 18, and I have saved up 3000 dollars to go towards getting a new puppy.
I already have a female schnoodle but she is really friendly with other dogs. I was wondering, I have heard alot of people say that two females cannot get along. I really wanted a female yorkie and I was wondering if this is true