The purpose of this new model is to provide a movable buckle.It includes the upper receiving part.Including a baffle plate,A guide unit at the front end of the baffle plate,And a clamping unit at the rear end of the baffle plate,The clamping unit has a first plate.A second plate set apart from the first plate,A detachable piece tightly covering the first plate and the second plate；And the reception department,It includes a body unit which can be disassembled from the guide unit of the upper receiving part.The back end of the body unit is assembled with one end of the belt body.The other end of the belt body can be closely positioned on the first plate.Between the second plate and the detachable part.The utility model can be used for the user to select a belt body with a retention margin suitable for the applied length of the pet neck in advance, so that the two ends of the belt body and the upper and lower bearing parts are fastened, which can ensure that the length of the belt body will not be reduced when it is pulled, causing the pet neck to be strangled and suffocated.本新型之目的即在於提供一種活動扣，包含一上承接部，包括一擋板、一設於擋板前端的導引單元，及一設於擋板後端的夾固單元，夾固單元具有第一板件、一與第一板件間隔設置的第二板件、一將第一板件與第二板件緊密包覆的可拆件；以及一下承接部，包括一可與上承接部的導引單元進行拆組的本體單元，本體單元後端與一帶體的一端組裝，帶體的另一端可緊密地位於第一板件、第二板件與可拆件之間。本新型可供使用者預先選定保有裕度合適於寵物頸部套用長度的帶體，使帶體二端與上、下承接部之間是緊固，能夠確保帶體遭拉扯時其長度不會縮減造成寵物頸部有被勒住窒息的憾事發生。
