the dog should point to the houses.
first you make all the nodes. then you make the linked list:
dogNode.setnext(houseNode);houseNode.setnext(houseNode2);houseNode2.setnext(houseNode3);
houseNode3.setnext(treeNode);treeNode.setNext(treeNode2);treeNode2.setNext(treeNode3);
then you set the bg as jungle.jpg and then drawFromMeOn(bg)