Abstract: A collar for pets includes an adjustment belt and a neck belt wherein the adjustment belt has a plurality of engagement holes equidistantly distributed at the surface of one side thereon, and the neck belt is provided with an engaging hoop attached at one side thereto. At the other side of the adjustment belt and the neck belt are respectively disposed a first and a second coupling hoops with a first and a second movable coupling belts attached at the other side of the coupling hoops thereof. The first/second movable coupling belts are respectively provided with a D-shaped first/second leash hoops at the outer side of the other end thereof, and a first/second passages disposed at the middle section thereon for holding a male and female buckle pieces with elastic buckling legs and buckling holes disposed thereon respectively.