Interesting set of tracks, man. Friggin big, whatever they are from. It's crazy you posted this because a buddy and I found a big set of tracks last weekend while shed hunting, too, that looked eerily (sp?) similar to the pics you posted up here. We took pics with my hand beside them, and my hands are damn near identical in size to yours... I'll have to get him to send me the pic if he's still got it on his phone, and post it up here for comparison. The set we found were in a creek bottom at the covergence of three ridges, right were the woods funnels down into some ag fields. My first thought was dog also, but we too were in an area that was pretty far away from any houses and such.