Welcome to YT!!
The way I see it - one of two things are about to happen. You will either be unable to find the owner and will fall deeper in love with Myles and he will become a loved part of your family. OR you will find the desparate owner of Myles, but after falling in love, will have no other choice but to find another Yorkie that needs your wonderful home and family. I'd say either way, both you and Myles are blessed.