When two dogs, named Hunter and Chubby, are chained outside during a harsh winter in Pennsylvania, they must try to survive while obeying the orders of their owner, Charlie Davidson.
Hunter is a devoted hunting dog whose purpose in life is to accompany Charlie. Chubby is Hunter's close friend. Both are living with the disturbing, but true, knowledge of 'the rule for their kind', which predicts when they may possibly die.
In Hunter's Purpose the rule comes true for Hunter and he must save the man who caused his demise.
Hunter's Purpose is a race against time and disasters that befall Charlie and the people close to him. Hunter becomes a helper, which is a different type of guardian angel. He must not only save Charlie, Debbie and Susie; but he must open up Charlie's heart and mind for the greatest hunt of his life, the hunt for the road to salvation.