Deed Not the Breed - S5.E19

Dash is befriended by a stray dog, but when she brings it back to the station, it tries to attack Nick and generally causes havoc. When Tom orders her to send it to the pound, Dash defies him, becoming almost obsessively defensive of the animal. Could this attitude have something to do with the news she has just received about her medical condition? Instead of obeying Tom, Dash advertises on local radio for the owner of the dog to come forward. Unfortunately, two separate contenders appear and, judging by the dog's attitude, neither of them is the real owner. What is going on? Dog attacks have been reported in the area, and the Heelers suspect Dash's new canine friend is the culprit.