Finding Lost, by Holly Goldberg Sloan

When Cordy's father died, her family had to rely on the charity of their friends and neighbors.  A friend found her mother a job as a housekeeper that came with a dilapidated boathouse in which Cordy, her little brother, and Mom could live.  Two jobs gave them barely enough money to squeak by, but nothing for "UE" (unnecessary expenses).  So, when a stray dog follows Corey home from school, she knows already that it is unlikely she'll be able to keep it.  But surprisingly, Mom lets the dog stay and she names him "Lost."

A series of surprises await.  Lost leads Corey to the unusual sight of a pod of dolphins (including an apparent albino) swimming in the river. Her little brother learns of a free clinic for doing check-ups for animals.  And when they take Lost in for a check up, the veterinarian strikes up a friendship with Corey's mother that sparks into something more serious.  Corey's none too pleased that her mother appears smitten with the vet.  She worries that Mom will forget about Dad and want to leave their home.  But in the end, things work out -- just not how Corey imagined they might.

There's a bit too much happy ending in the final chapter, but up to that point the story is bittersweet with a combination of good news and bad that felt right.  Corey's intelligence and inquisitive nature shines throughout.  And even when she is making poor choices, she recognizes her flaws.  Corey's acknowledgement of her grief and the subsequent re-opening of her heart becomes compelling. A poignant and gentle story about a family in transition.