A picture would be nice to tell for sure but I wouldn't let the Yorkie out alone, especially if you have open areas-he would be easy pickings I'm afraid. I am in Seattle and it could be any number of raptors, we have many here in the Pacific Northwest that would have brown feathers-check the range maps in your bird guides.
Reach high, for stars lie hidden in your soul. Dream deep, for every dream precedes the goal