Sentence 1: Tim had a dog that was a black lab. 
 Sentence 3: Tim's friend informed him that his dog needed to run more 
 Sentence 4:  Tim decided to take up running 
 Sentence 5:  Tim began running with the dog and they both began to feel happier 
 Option 1: Tim's friend was a local dog whisperer. 
 Option 2: Tim's friend knew nothing about dogs.