Abuddy of mine who is a K-9 Officer had thought his dog had escaped one night when he got home from going out but it ended up being a coyote. He call Animal Control and reported it. They said they have had reports and confirmed sightingsof them and are actively trying to catch them around his location (Fairfax Station). It doesn't surprise me at all especially since we saw a 300 pound black bear this summer in my neighborhood in Centreville.