Sentence 1: Hannah and her friends decided to go on a hike. 
 Sentence 3: Hannah was worried her friends might be annoyed she was bringing Kobe 
 Sentence 4:  However, Kobe was excellently behaved for the duration of the hike 
 Sentence 5:  Hannah was thrilled to take out her dog and be with her friends 
 Option 1: Before they left she decided she wanted to bring her dog, Kobe. 
 Option 2: When they left she decided to bring her cat, Kobe.