The Great East Japan Earthquake occurred in 2011, and the Kumamoto Earthquake occurred in 2016. These disasters affected not only humans but also many animals. The Ministry of the Environment formulated the “Disaster Preparedness Guideline for Humans and Pets” in 2018. The guidelines state that the self-help of pet owners is fundamental in dealing with disasters. With the aim of furthering preparations for pets in the event of a disaster, we conducted an exploratory investigation of the factors that facilitate or inhibit disaster preparation for pets and examined how the psychological relationships between pets and owners affects the degree of execution for “preparedness in everyday life” and “preparing for disasters.” We conducted an Internet-based survey of pet owners (N = 260). We then conducted ordinal logistic regression analyses with “preparedness in everyday life” and “preparing for disasters” as objective variables. We found that the “number of pet friendships” (friends made through interactions because of one’s pet) facilitated “preparedness in everyday life” and “preparing for disasters.” Moreover, the “degree of animal welfare practice” facilitated “preparedness in everyday life”, and the degree of “difficulty being separated from pets” facilitated “preparing for disasters.” We discussed the contributions and limitations of this study.