I'm so sorry to hear this sad news! I will pray for his safe return.
I don't know if anyone posted this link that gives info on how to find a lost dog:
http://www.yorkietalk.com/forums/gen...st-yorkie.html
Once I thought I'd lost Libby. She ended up being in a cabinet under the bathroom counter, but I thought I'd never see her again also. Have you checked every nook and cranny in your home?
One thing I did while looking for Libby...first I went by myself walking the neighborhood and then I came home and got Maddie. Maddie barked now and then and I thought that might get Libby's attention. Try taking your other pups for a walk.
Hugs to you, I will be praying! Don't give up hope...so many missing yorkies have gotten back home!