CONROE — Von Pardue leaves his north Conroe home every day at 5 a.m. for a mile walk, but on Wednesday his exercise routine unexpectedly turned into a wrestling match with a vicious pit bull. The dog lost. Pardue unwittingly choked him to death. The 65-year-old retired truck driver, who suffered bites on his arms and hands, said the dog attacked him about five minutes into his walk. He said he heard a dog barking and thought it was in a yard, but seconds later saw the dog running toward him. ''I turned to face him, and when I saw...