I'm so sorry to hear your dog got out. Hopefully someone caring finds him and returns him! I would do all the previous suggestions, I find so many dogs at our shelter that were stray and noone comes to look for them, its so sad. Please check there, leave a flyer there and leave them all over the place, you would be surprised how far they can travel, when my mom lost her boxer we put flyers up all over the area, she was found quite the distance from there! A area we weren't putting flyers up in, it would of took a good 20-25 min walk to get there
Good luck