Disclosed here is an active device for monitoring animal being capable of measuring vital signs of the animal and actively signaling an external apparatus. The device comprises a pin adapted to penetrate a predetermined portion of the animal； a gasket having two ring portions formed as one piece； a base having a first sleeve portion for allowing the pin to squeeze through so as to be engaged with each other and blocking the pin from slipping off after engagement； a monitoring unit； and a cover having a second sleeve portion to receive the first sleeve portion, and being joined with the base in a waterproof manner so as to accommodate the monitoring unit therein.於此揭示一種主動式動物監控裝置，能夠量測動物的生命徵象以及可以主動發訊給外部設備。裝置包括：插梢，用於穿過動物身體的預定部位；墊圈，具有一體成形之雙環部；基座，具有第一套筒部，允許插梢能夠擠壓穿過而彼此嚙合且在嚙合後防止插梢滑脫；監控單元；以及，蓋子，具有能夠容納第一套筒部之第二套筒部，以及，與基部相接合而以防水方式將該監控單元密封於其間。
