for The Berenstain Bears Lose a Friend by Stan Berenstain, Jan Berenstain, and Mike Berenstain
Sister Bear loves taking care of her pet goldfish, Goldie. Sister feeds Goldie every morning and evening, cleans out her tank, and even gets her a beautiful fishbowl castle! But when Papa and Mama find Goldie floating belly-up in her tank, they worry about how Sister will feel. How will the Bear family cope with the loss of Goldie, the best goldfish in the world?