Ever see someone out jogging with their dog? The jogger sweats over the entire surface of his body and is thus able to throw off excess body heat over the entire surface of his body. The dog can only throw off excess body heat through his tongue and the pads on his feet. If the jogger isn't careful, he could easily run his best friend to death, especially on a hot day.
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Ever tried that with a horse?
Of course, horses sweat over their entire bodies.