Lost His Friend

My elder son moved to Phoenix, AZ three weeks ago.  He moved in with a friend who is allowing him to stay until he finds his own place.  Last night his roommate left open the door to the house and my son’s cat escaped.

24 hours later, still no sign of Marley, my son’s best friend and "family" that is near him.  No sign of her, and the temps hit 110f again today.  My son is devistated.  He has posted notices, visited neighbors, called and called and walked the street calling, contacted the different agencies in town.  He is starting to give up hope of finding his friend.  And here I sit, powerless to help my son.

Any words of encouragement?  Any words of advice?