Looking for a children's book from the 1950s about an anthropomorphized animal who's abandoned by his family

Question

I am looking for a children's picture book that I read in the late 1950s about an animal (don't remember what kind of animal, possibly a mouse or hamster) who was a member of a large family. He came home from school one day to discover that his family had moved, apparently without realizing he was not with them. I remember that he wandered through the rooms of his house, emptied of all furniture and belongings. I don't remember anything after that! If anyone is familiar with this book, I would appreciate your letting me know.

Answer 1

Walter the Lazy Mouse by Marjorie Flack

Description from goodreads.com:

Walter is a lazy mouse. He is so lazy that he always misses school and spends all his time in bed. He is so lazy that eventually his family forgets about him and moves away…without him. Alone and scared, Walter heads out into the world to search for his family. He travels through a dark forest and soon meets a turtle and some frogs. Walter decides to create a new home on Mouse Island. His froggy friends live nearby, and Walter tries to teach them things. With his own island―and friends who depend on him―Walter must learn to take care of himself. There is no time to be lazy! But will Walter ever see his family again?

First published in 1937.