Lost Friendly Yellow Lab in Maynard - Help!

Yellow lab. Wearing orange/black collar. Unaltered male. Friendly. Nonhunter. Used to cats,dogs,livestock. Gentle with children and adults. Went missing from home around 4pm-5pm on 4/26. Hangs around the DG store in Maynard off and on if his human isn't home. Sometimes goes to home on Falcon Trail in Maynard where he lived briefly. Hasn't shown up in either place over past few days.