There is a team of dog snatchers active in the villages North of Glasgow.
Glenbrae Veterinary Clinic in Bearsden delivered the warning on their Facebook page.
Two women and two men are knocking on residents' doors, pretending to work for an energy company in order to scope out the dogs living in each home.
They are then putting cable ties on the lamp post beside the house so they know these people have dogs so they can go back and steal them.
They have been active in Bearsden, Milngavie, Millton of Campsie and Lennoxtown.
Rhu Bay facebook page reports that cable ties on lamp posts have been seen in Rosneath, Garelochhead and Rhu.