The purpose of this research was to examine the experience of a woman who lost her companion pet through art therapy and to explore the meaning of such experience. Accordingly, this research conducted art therapy sessions once or twice a week from August 2017 to October 2017, for a total of 20 sessions, with one woman who had lost her companion pet. The program was semi-structured, which enabled the participant to choose a topic and medium to freely express her emotions; the researcher also suggested topics when necessary. This was a qualitative study using the narrative inquiry method of Clandinin and Connelly (2000). Through narrative inquiry, the research participant’s experience was analyzed as follows: “Missed Byeoli,” “Regret and Blame Oneself,” “Stuffy and Anger,” “Expression of Hurt on not Getting Support for the Sadness,” “Meeting the Byeoli Again,” “Hole in a Heart,” “Goodbye Again,” “To the Ordinary Life.” By organizing these eight meanings, the research generated the following three topics: “Face to Loss,” “Mourning in the Art Therapy,” “Back Again into the Life.” It was expected that this research would contribute to an understanding of the sadness people feel after losing their companion pets, and spread the necessity of related research on art therapy.