Fastener structure for connection

The utility model discloses a fastener structure for connection. By means of protection sheets which are respectively provided at a fastener base and an upper cover, a protection groove which can accommodate a push block and an antislide strip of a movable bolt is formed. The back side of a movable bolt is provided with a return spring. After the return spring abuts against the movable bolt, a front spacing part the movable bolt is buckled on a stop block so a buckling groove of the fastener forms a closed space. A retaining ring on a pet loop is limited in the buckling groove. A traction rope of a connection buckle ring is used as a media for controlling the dog. The push block and the antislide strip of the movable bolt are respectively accommodated in the protection groove. The retaining ring does not contact or squeeze the push block and the antislide strip when the pet does restless struggling and performs leftward and rightward squeezing motion. The spacing part of the movable bolt can be buckled on the