Our daughter always did great when we could read books about this type of subject. Here are some books you could check out from the library or purchase.
Goodbye, Mousie
This is an excellent picture book for 3-5-year-olds. With denial, then a mixture of anger and sadness, a little boy reacts to the death of his pet. With sensitivity and love, his parents help him prepare to bury Mousie. He finds comfort in painting the box Mousie is to be buried in and filling it with things the mouse would enjoy. This reassuring story by Robie H. Harris is beautifully illustrated with muted watercolor and black pencil artwork by Jan Omerod. (Aladdin, 2004. ISBN: 9780689871344)
The Tenth Good Thing About Barney
This children’s picture book by Judith Viorst is a classic. A boy grieves about the death of his cat, Barney. His mother suggests he think of ten good things to remember about Barney. His friend Annie thinks Barney is in heaven, but the boy and his father aren’t sure. Remembering Barney as brave, smart, funny, and more is a comfort, but the boy can’t think of the tenth thing until he realizes that “Barney’s in the ground and he’s helping grow flowers.” (Atheneum, 1971. ISBN: ###-###-####)
Jasper’s Day
“Jasper's Day,” by Marjorie Blain Parker, is a poignant, yet wonderfully comforting, picture book about a beloved dying dog's special day before he is "euthanized" by the vet. Having been through the experience several times, the book really moved me. Janet Wilson’s chalk pastels beautifully illustrate a little boy's love for his dog and the whole family's sadness as they say goodbye by giving Jasper a last day filled with his favorite activities. (Kids Can Press, 2002. ISBN: 9781550749571)