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