It's simile. It compares the dog to a bulldozer to make it more dramatic.
The answer is "Nature"
The scene described in Walden focuses heavily, if not exclusively, on nature and the effect that the natural wonder of Walden Pond had on Thoreau. This is also the most key element of Transcendentalism: the search for enlightenment not in man-made society but in the natural world.
<span>the answer is B>"As in Beckett's play, Rosencrantz and Guildenstern pass the time by impersonating other characters, engaging in word play, and remaining silent for long periods of time." </span>
