Most sleds have a brake, and the dogs are trained to obey directional commands.
Some of the most common forms of these commands:
"Hike!" = move faster
"On by!" = continue in a straight line, ignore whatever you were looking at
"Gee!" = turn right
"Haw!" = turn left
"Easy!" = slow down
"Whoa!" = stop
"Let's go!" = start moving
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