Dragon Bones — Paul Hindman

When Montana, Hank's big black Labrador, digs up a huge bone in the backyard, Hank thinks it might be a dinosaur bone. But Montana chews it up before Hank can show it to the man from the museum. Then Montana starts acting funny, sounding funny, and looking funny. Green scales...horns...wings. Soon there is no doubt about it--Montana has morphed...into a dragon!