(S (S (S (NP (DT An) (NP (ADJP (BASENP (NN 82) (NN year)) (JJ old)) (NN woman))) (VP (VBD was) (VP (VP (VP (VBG walking) (NP (BASENP (PRPD her) (NNP Shih) (NNP Tzu) (NN breed)) (PP (IN of) (BASENP (NN dog))))) (PP (IN in) (BASENP (PRPD her) (JJ front) (NN yard)))) (BASENP (JJ last) (NN week))))) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP she)) (VP (VBD came) (PP (IN under) (NP (BASENP (NN attack)) (PP (IN by) (BASENP (NN three) (NNP Pit) (NNPS Bulls))))))))) (PERIOD .))