We've been a couple of mutts, who've bitten off a bigger bit than they can chew.
( We ( ( 've ( been ( ( a couple ) ( of ( ( mutts , ) ( who ( 've ( ( ( bitten off ) ( a ( bigger bit ) ) ) ( than ( they ( can chew ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP 've) (VP (VBN been) (NP (NP (DT a) (NN couple)) (PP (IN of) (NP (NP (NNS mutts)) (, ,) (SBAR (WHNP (WP who)) (S (VP (VBP 've) (VP (VBN bitten) (PRT (RP off)) (NP (DT a) (JJR bigger) (NN bit)) (SBAR (IN than) (S (NP (PRP they)) (VP (MD can) (VP (VB chew)))))))))))))) (. .)))
We are like dogs in many ways. 
( We ( ( are ( like ( dogs ( in ( many ways ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP are) (PP (IN like) (NP (NP (NNS dogs)) (PP (IN in) (NP (JJ many) (NNS ways)))))) (. .)))