Sentence 1: Ben liked to compete with his dog in Schutzhund tests. 
 Sentence 3: Today was Nero's first test 
 Sentence 4:  Nero was startled at first but then enjoyed every minute of the test 
 Sentence 5:  Nero came in second place, pleasing Ben enormously 
 Option 1: He had trained Nero, his Rottweiler, for over a year. 
 Option 2: They were unbeatable.