Update: Bosco's owners discovered he was missing and called the town. He was picked up over the weekend.
From Cheryl via our Facebook page:
"Found a black dog with a white tuxedo marking with Madison owner tags walking on White Cedar Dr. about 7:15pm. Dog's name on tag was Bosco. Tried calling the number on tag but number was no longer in service. Madison police department picked up the dog. In case someone is looking for their dog Bosco. Very sweet dog!!"
The number for Madison Animal Control is 203.245.2721.