thanks for the icon, shoo :^)
at first i thought they might be mountain lion, but i read that lions and other cats retract their claws when walking. the tracks were directly in line with each other, which neither of my own dogs do, so i doubt that they were domestic dog tracks, especially due to the size. i'm thinking maybe wolf? there were some smaller tracks nearby that i think were coyote, but again, i'm not sure. they were much more doglike. the spread-out nature of the big ones combined with the size is what makes me think wolf.