Dog's purpose (Juvenile)

When Bailey meets eight-year-old Ethan, he quickly figures out his purpose: to play with the boy, to explore the Farm during summers with the boy, and to tidy the boy's dishes by licking them clean (only when Mom isn't watching). But Bailey soon learns that life isn't always so simple--that sometimes bad things happen--and that there can be no greater purpose than to protect the boy he loves.

Toby, an unusually calm beagle puppy, finds his purpose when Mona and her mother adopt him and teach him to be a therapy dog at a nursing home.

"Even though Bella has to hide from the neighbors and learn boring games like No Barks and Go Home, she loves her boy Lucas. Then one day Bella is picked up by Animal Control and Lucas is forced to send her to a foster home far away. Bella waits and waitsfor Lucas to come and get her, but days go by and he does not come. Finally Bella realizes what she needs to do--she needs to Go Home to Lucas--and even four hundred miles of dangerous Colorado wilderness...