Don't just call the SPCA (both Philly and Montco) and PACCA, you need to go there and look for your dog. I had a dog get out once and called and they said they didn't have any dog that fit his description. So we ended up going down and there he was, locked in a cage. He was about 4 hours away from being euthanized.

Microchips are well worth the money nowadays. All dog owners should microchip their dogs. It's not expensive.

I'll say a little prayer that you find your dog. Good luck!