Sentence 1: One day, Orly took his cat Dot to the vet. 
 Sentence 3: The vet sent Orly home with worm medication to give to Dot 
 Sentence 4:  Orly dutifully gave Dot her medication every day for a week 
 Sentence 5:  After the week was up, Dot was cured of her worms 
 Option 1: When the vet examined Dot, he found that she had worms. 
 Option 2: When the vet examined Dot, he found that she was perfectly healthy.