Sentence 1: It all started with itchy ears. 
 Sentence 3: By the time Kay got her dog to the vet Pogo was really sick 
 Sentence 4:  The vet said that Pogo had an ear infection and gave him antibiotics 
 Sentence 5:  Poor Pogo was sick for nearly a week 
 Given Sentence 2: He wanted to try it himself.