Before the guy gets taken away, he makes Andy and Laurie promise to look after the dog, which is an easy promise to make, since Andy is the founder of a dog rescue organisation. At the police station, the passerby is identified as Matthew Jantzen, who turns out to be wanted for murder. Andy is struck by the fact that Jantzen, a man supposedly on the run, would nevertheless intervene to help a dog, and even though Andy is never keen to take on a new case, he can't say no to someone who is clearly as much of a dog lover as he is.
