Moo by Sharon Creech

Reena's not sure what to expect when her family packs up and moves to Maine, but somehow she hadn't even considered befriending a cow.

Zora the cow comes with an elderly lady, Mrs. Falala, who owns her. Reena's parents volunteer their kids to "help out" at the neighbors, which is a learning experience for all involved.

The book is mainly told in prose, with some well-placed poetic pieces and graphic presentation. Reena's 12 years old, but I think the book could be read younger, too. It's sweet and funny, a little sad and very, very good.