Sally goes to heaven / written and illustrated by Stephen Huneck.

Enhanced descriptions from Syndetics:

Sally Goes to Heaven is a wonderful, joyous book to help provide gentle insight into the natural cycle of life of a pet, or to share with young children who have recently experienced the loss of a beloved animal. In this book, Sally passes away and goes to heaven, where she lives happily and helps her family on Earth find a new pet. The book includes a removable magnetic photo frame that readers can use to hold a picture of their own beloved pet.

Praise for Sally Goes to Heaven
"Any family who has ever loved and lost a dog will find comfort in Sally Goes to Heaven. Stephen Huneck's beautiful illustrations and simple text evoke an afterlife that is everything we could hope for our dogs - and ourselves." - Ken Foster, author of The Dogs Who Found Me and I'm a Good Dog

"The final entry in the late Huneck's series about Sally the black Labrador is a touching account of Sally's death from old age and her joyous experiences in heaven."
--Kirkus Reviews, STARRED REVIEW

"Huneck's instantly recognizable woodcuts make each scene feel iconic, and his plainspoken prose will provide grieving young pet-owners with a measure of relief."
--Publishers Weekly, STARRED REVIEW

"This title can help children remember the good times in both Sally's or their own pet's life."
--School Library Journal

"The folk art-style woodblock illustrations, in their directness and simplicity, are as comforting as the text."
--Booklist