The study takes an interest in the event of self-sacrificed cow and dog which had been performed at Seonsan region in Kyongbuk Province from the middle of 17th century to the middle of 18th century. At that time, local governors and local gentry established a monument, drew a picture and published a book to commemorate cow and dog dyiing for each her owner. This work recognized as one of the endeavors which effectively deliver the Samgang(the three fundamental principles in human relations), especially Chungyi(the loyalty), as a practical morality of Seonglihak(a philosophy of human nature and natural laws as well as the Choseon dynasty's ruling ideology)to the lower people.