Hm. Well, it does look legit to me, just small. It claims it's being run by four people. They have a typo on their home page.
Also, I don't see the yorkie listed.
If you work with them, I would have some questions:
- ***Where do they get these dogs from?
- Where are they keeping these dogs? How are four people fostering all these large breeds together?
- What is the background on the dog you are interested? Temperment? Health Issues?
- What do they base their prices on?
- Can they verify their charity status? What % of the adoption fees goes towards the dogs.
This is just off the top of my head.

Good luck to you on finding your yorkie.