Sentence 1: Fred was a dog owner who was thinking of adopting another dog. 
 Sentence 3: The idea was to see how well his dog got along with any new ones 
 Sentence 4:  Fred found a mutt who seemed to hit it off with his current dog 
 Sentence 5:  He brought home the mutt and they lived happily ever after 
 Option 1: His girlfriend convinced him to get a cat instead. 
 Option 2: He went down to the humane society with his current dog in tow.