Miss Mango

As the subject says, my dog is missing. I am so freaked out, crying and terrified for him -- he must be so terrified, too. I blame myself for his disappearance.

Right now I desperately need advice & suggestions on what else I can do to find him. Ill post what weve done -- which doesnt seem like much -- followed by more information* on why this situation is scarier than if he just wandered out.

Here is the list so far:
# I, my sister and my mother have walked up and down our alley looking and trying to listen for him while calling out his name.

# Weve slowly driven (solo and in pairings) around his territory/our neighborhood, then beyond, calling out his name, whistling and asking anyone we could if theyd seen him.
[One of the problems with this is describing his coloring -- most people arent familiar with blue merle, so we ended up giving out different descriptions; black and grey finally won out.
It occurred to me later that I should have been saying silver instead of grey... Ill get more into that in a bit.]

# We called the following places: the county Humane Society, the citys Animal Control division (no one answered, my sister left a message), and the PD.
My Moms friend had a great idea: call the neighboring boroughs PD because we live one street over from the city line. That borough isnt part of his territory, but obviously our search has to be expanded...

# I posted on Craigslist under pets and lost & found. My sister said she also posted something elsewhere online.

After hours of driving, walking, yelling and tears, we all have to reserve our physical energy... I keep getting up and going to the back door and calling him, hoping hell be close, hear me, and make his way back to the yard. But thats just not good enough. I feel like Im doing nothing.
Im so scattered, I cant organize my thoughts, and my current inaction along with the feeling of failure is making my insanity flare up big time.

That brings us to why Im here: Advice about what to do next. I figured I should take the risk** of posting lost dog messages online, but I dont know where else to go.

I have many, many pictures so we can use them to make flyers...

God, I dont know what to do. I love that dog so much and Im afraid something horrible has happened to him. Im so scared -- he could be dead or dying, and all alone...