•2011. An unparalleled earthquake struck Japan.•People were rebuilding their lives after severe damage.•Animal Relief Headquarters sent pet food and other materials, but animals remained in crisis. They required more support.

The cardboard boxes themselves became media. Reuse cardboard boxes, which contained relief goods, as temporary pet houses. By slightly changing the way they are cut, boxes could be used for shipping and as pet shelter. They previously disposed after use were reused to relieve pets’ stress and make refugees and pets could live together.

Relief Pet Houses were used in 72 animal shelters for 3,000 pets. 88 companies, NGOs and universities collaborated with us. The Pet House not only played a role in the shipping of relief goods and reduction of waste. It also gave peace of mind to people who love their pets.