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The Dog Who Knew Too Much - Spencer Quinn (Chet & Bernie, Book 4)
Product Description

Humor and intrigue combine for a "thoroughly entertaining comic mystery" ("Booklist") as Spencer Quinn's engaging and unlikely team of crime solvers takes on the case of a boy gone missing from a wilderness camp.
The kid's mother thinks her ex-husband snatched their son, but Chet's always reliable nose leads Bernie in a new and dangerous direction. Meanwhile, matters at home get complicated when a stray puppy that looks suspiciously like Chet shows up. Affairs of the heart collide with a job that's never been tougher, requiring our intrepid sleuths to trust each other even when circumstances--and a rival P.I.--conspire to keep them far apart.