As I am doing research for a personal project I have been reading LOTS of books for the 4-8 year old age group and I came across the most wonderful book. It's called Before You Were Mine written by Maribeth Boelts and pictures by David Walker. If you've ever lost a beloved pet or have adopted pets from rescues, you will LOVE this book as well. It is so well done! The writing and the art is fabulous and really pulled on my hearts strings. Get the tissues out and go check it out!