as you watch them clumsily mugging their way through snow dogs 
(ROOT (SBAR (IN as) (S (NP (PRP you)) (VP (VBP watch) (S (NP (PRP them)) (ADVP (RB clumsily)) (VP (VBG mugging) (NP (PRP$ their) (NN way)) (PP (IN through) (NP (NN snow) (NNS dogs)))))))))
(ROOT (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (S (NP (PRP )) (ADVP (RB )) (VP (VBG ) (NP (PRP$ ) (NN )) (PP (IN ) (NP (NN ) (NNS )))))))))