This creation system provides a kind of pet closed cardiac massage assistor, is provided at the thoracic cavity for placing one pet of what, and in response to the figure of difference guiding user's force size, including an ontology, a pressure sensor, a control setting apparatus and a warning mould group. There is ontology a force area to be provided with installing pressure sensor, and user system presses force area, it controls setting apparatus telecommunication and connects pressure sensor, for being set according to pet figure, a plurality of pressure reference numerical value are stored in control setting apparatus, what pressure sensor senses go out a pressure value Hou and are compared with the pressure reference numerical value of correspondence, and opposite warning is provided through warning mould group and gives user, it is allowed to carry out first aid to pet in the correct way to adjust its pressing power, promotes the successful of first aid.本創作係提供一種寵物胸外心臟按摩輔助器,供以放置於一寵物之胸腔處,並因應不同之體型導引使用者施力大小,包括一本體、一壓力傳感器、一控制設定器及一警示模組。本體具有一施力區供以安裝壓力傳感器,且使用者係對施力區進行按壓,控制設定器電訊連接壓力傳感器,供依據寵物體型進行設定,控制設定器中儲存有複數個壓力參考數值,於壓力傳感器偵測出一壓力值後與對應之壓力參考數值進行比對,並透過警示模組提供相對的警示予使用者,以調整其按壓力道使之以正確的方式對寵物進行急救,提升急救的成功性。