The Legend of Diamond Lil by Doreen Cronin

The Legend of Diamond Lil, second book in the illustrated J.J. Tully mystery series, is perfect for elementary-school kids who love adventure and animals. New York Times bestselling author Doreen Cronin brings the same wonderful humor to the JJ. Tully whodunits that she did to her beloved picture book bestsellers like Diary of a Worm.
 
In this sequel to the chapter book The Trouble with Chickens, all search-and-rescue dog J.J. Tully wants is to enjoy his retirement. But mama chick Moosh and chicks Dirt and Sugar are acting strange. A possum keeps finding its way into the chicken coop. And J.J. has questions about Diamond Lil, the fancy new dog next door. He’ll have to track down the clues and sniff out the evidence to save the day.