The invention relates to a pet fastener, which comprises at least one movable bolt, and the movable bolt comprises a hook body.And a rotating body for forming a hook between a buckle and the interior of the hook body.The hook body has a first part.A second part connected with the first part to form a downward arc,A third part connected with the second part to form an upward arc；And a fourth part at the upper edge of the third recess for the rotator,A gap is formed between the first part and the third part for the access of the retaining ring.The fourth part is provided with an elastic element which can be connected with the rotating body；When the elastic element is expanded so that the rotating body is tightly closed against the gap,The buckle may always be situated between the first part and the third part,And when the elastic element is retracted so that the rotating body is far away from the gap,The snap ring can enter into the notch.Therefore, this creation can ensure that the clasp will not be lost due to the slippage of the gap caused by the pet's arbitrary restless struggle.本創作是一種寵物扣具，其至少包含一活動栓，該活動栓包括一勾體，及一可供一扣環與該勾體內部之間形成勾制的轉動體，該勾體具有一第一部、一與該第一部連接以形成朝下弧度的第二部、一與該第二部連接以形成朝上弧度的第三部，及一位於該第三部凹處上緣以供該轉動體設置的第四部，該第一部與該第三部之間形成一可供該扣環出入的缺口，該第四部設有可與該轉動體呈連動的彈力元件；於該彈力元件外擴致使該轉動體緊閉抵頂於該缺口時，該扣環可始終位於該第一部與該第三部之間，並於該彈力元件內縮致使該轉動體遠離該缺口時，該扣環可進入該缺口內部。因此，本創作能夠確保該扣環不會因寵物的任意躁動掙扎而導致由該缺口出現滑脫造成走失。
