The text plays on the literal position of a lead dog in a sled team, implying that the lead dog has an unobstructed view, while the other dogs have a view obstructed by the lead dog. However, it also suggests metaphorically that not being in the lead or in charge can offer a different but still valuable perspective. The humor arises from the unexpected twist on the phrase 'the view never changes', but it does not rely on different meanings of the same word or similar-sounding words.
If you ' re not the lead dog , the view can be very interesting !