A pet collar includes a buckle having a through hole and a first transverse bar and a second transverse bar are connected to two sidewalls of the buckle. A first protrusion extends from a top of the first transverse bar and two second protrusions extend from two respectively undersides of the first and second ends of the frame respectively. A belt has a first end fixed to the second end of the buckle and a second end of the belt extends through a first opening between the first transverse bar and the first end of the buckle via the underside of the first end of the buckle and passes over the first and second transverse bars and extends through the second opening between the second transverse bar and the second end of the buckle. The holes in the belt are engaged with the first protrusion and the two second protrusions.