The Case of the Burrowing Robot is the 42nd book in the Hank the Cowdog series by John R. Erickson. Sally May has planted her own vegetable garden. But something dug up things in the tomatoes very neatly. Hank has started digging space monster robots out of that hole. People blamed him for seeing Hank in that garden. Hank will do it to vindicate himself, to gain the trust of Slim, Loper and Sally May.