Well since this is going NO WHERE (with the meet-up group-thing)...
If the original poster or any other Philadelphia residents would like to PM me I'm sure Britney and Brooklyn would love to meet your dogs! We are also at the parks but rarely come across other yorkies or small dogs.
I live very close and/or walkable distances to several of the center city-area parks. It'd be great to meet in the next month or two before it gets to cold out!