OH no !!
I'm SO sorry
this site is great offering up prayers for lost little dogs...also you may want to go read this thread for ideas for finding lost pets :
http://www.yorkietalk.com/forums/showthread.php?t=49514
have you spoken to all the neighbor kids ? They usually know who has new dogs ...there's a good chance someone has him...did he have tags or a chip ?
ALL THE BEST to you and I hope you find him really soon & please keep us updated ...many of us really do worry when we read things like this ok ??