After Digger Dog sniffs out a must-have bone, he begins to dig. He soon finds that “the ground is too hard and the bone is too deep” for his shovel. As his friends, a rabbit and a mouse, set up the orange cones of the construction site and don their hard hats, Digger Dog finds a better tool, a yellow backhoe, “so he can dig deeper and quicker.” But this “little digger” doesn’t do the trick, so Digger Dog finds a “bigger digger.” After successive tries, Digger Dog acquires the biggest digger ever, so big that it requires a fold-out page to be viewed. Finally, Digger Dog and his friends reach what they believe is the biggest bone ever. But it proves to be only the fingertip of a very large, long-buried dinosaur, requiring another fold-out to fit. Bright yellows and reds with polka-dotted dirt and cheerful, persistent animals offer great visual appeal while the comfortable, repeated text format makes this an excellent choice for a read-aloud or read-along. (Ages 3–7)