Sometimes a dog's favorite toy has sentimental value.
Sometimes it has actual cash value.
Sometimes it is merely the only "toy" that can withstand his play.
This pupper has utterly destroyed every ball, chewtoy, rawhide bone, and incidental garden tool that has gotten in his way. The only thing that survived was that big old yellow float. For dragging purposes we keep a nice cotton rope tide into the float attachments. The rope doesn't last long but it lets him position it right where he wants it. Now is the part about digging. That dang float kept rolling away on him. So that lazy dog dug one hole the exact depth and width to keep the float immobile. He gnaws happily on the rope and keeps his favorite toy right there. Until he wants to move it.