As Bear Bio has pointed out, all tracks get exaggerated in apparent size by soft mud, T-Star has noted the conspicuous claw prints, uncharacteristic, but not never seen in mountain lion tracks (when lions kick in their afterburners on hard surfaces, the claws come out...), and someone has mentioned the red wolf, never bigger than a coyote and incapable of leaving such a large print. I think the telling impression is that of the claw prints, which are those of a large domestic dog, typically unworn, distinctively sharp, not the claws of a wild animal, but those of an animal not giving its claws everyday hard use.