Microchip and collar with tags at ALL TIMES!  I just cannot stress this point enough.  If you look on YT the dogs that have been lost and never found were not chipped and were not wearing their collars/tags when they went missing.     
Recently, I was in contact with a woman in another state looking to surrender a yorkie.  It is a very long and messed up story but the short version is this:   
She caught this little girl in a trap because it running loose and she was worried it would be killed by coyotes (she lived in the country).  There was no chip and no collar.  She was not willing to place ads or give out her own phone number to look for her owners.  It was obvious she was loved and well taken care of.  She had the little girl for less than 36 hours and wanted to surrender her to Yorkie Rescue because she didn't want to bother any longer.  I offered to help her and placed ads, called animal control, police etc but she was 2 states away.  After 4 days she GAVE HER AWAY!  There was nothing I could do to stop it either and I'm still bothers me.     
				__________________  “Never argue with a fool, onlookers may not be able to tell the difference.”  Mark Twain      |