I am sooo sorry ! I just called and spoke to you. I live in Port Saint Lucie also and my yorkie is missing as well. I do know exactly what you are going through and how you feel.
Concentrate right now on your neighbors. Please knock on as many doors as possible TONIGHT. You might be surprised how far he may have gotten.
I wish I had my car with me right now , I would go !! My husband took the car and won't be back till 8 or so
If he gets home by then I will call you, I also have a amplified listening device that works pretty well.
Praying for your baby to get home soon. At least he has a collar with tags and microchipped.
If you need any help with places to contact. Let me know. I will post a craigslist ad for your yorkie and will list your number. Hopefully will check it.
(((hugs)))
Gen