I have had this same thing happen to me. If you post signs, put them up much further away than you would expect. Totally blanket a 2 mile radius if you can. We live on Cloister and my dog was found near Lakeland and Ferguson, 4 days later. Last year my dog ran away again and she was picked up by Animal Control. She now wears her collar and many tags and is micro-chipped. Best of luck to you and I will watch out for your little dog.