this toothless dog , already on cable , loses all bite on the big screen . 
(ROOT (S (NP (DT this) (JJ toothless) (NN dog)) (, ,) (PP (ADVP (RB already)) (IN on) (NP (NN cable))) (, ,) (VP (VBZ loses) (NP (DT all) (NN bite)) (PP (IN on) (NP (DT the) (JJ big) (NN screen)))) (. .)))
(ROOT (S (NP (DT ) (JJ ) (NN )) (, ) (PP (ADVP (RB )) (IN ) (NP (NN ))) (, ) (VP (VBZ ) (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN )))) (. )))