Where is the Green Sheep by Mem Fox is a great companion book when teaching The Parable of the Lost Sheep to preschoolers. Although Ms. Fox’s book is not based on the biblical lesson, it is a fun rhyming book about a lost sheep (that is found in the end) that would complement the parable in a way that preschoolers would enjoy.
Below is a link to a You Tube storyteller reading the book:
You can find the book online at various retailers.
I made a large version to read to my class from coloring pages based on the book purchased here:
We can remind the children that just like we looked for the green sheep in the story…Jesus searches for us when we are lost.