The Adventures of Onyx and the Guardians of the Straits

The book that started the adventures of Onyx... One stormy night, a homeless dog looking for shelter wanders onto a Coast Guard station in St. Ignace, Michigan.  She finds a dry and cozy hiding spot inside a boat's compartment.  When the boat launches and heads into the Straits of Mackinac for a search and rescue mission, the frightened dog is still hidden onboard.  But when the tireless Coasties are working to save a man overboard, Onyx the dog surprises everyone with her bravery, and she finds more than a home---she finds a purpose.