I must say CR, you made me grin when I read that. Stool diameter is an indicator of animal size? Speaking of size. A coyote's paw print is a more accurate indicator.
Say for the sake of argument. An animal typically pass's 2" diameter stools. Then say that same animal gets bound up for a wk. You suppose that same animal might then pass a mail box, when the dam breaks?
Paw size however doesn't change once a animal has matured. Stool size[diameter] can vary.