Unconditional Love.

Unconditional love is the main theme of the book. The main character who is first Toby, and then becomes Bailey, Ellie and lastly Buddy during his reincarnations, exhibits unconditional love, especially for the boy, Ethan, whom he meets in his second lifetime as a Golden Retriever. Bailey loves Ethan at first sight and Ethan loves Bailey. They show their love for one another over and over. The love remains throughout the rest of the book during his remaining reincarnations as other breeds. He always yearns for Ethan and misses him. In Bailey's final reincarnation as a black labrador, the two are reunited and recognize one another. Ethan is now an old man and Bailey reunites him with his first love, Hannah. At the end of the book, Bailey is at Ethan's side as he dies, comforting and tending to him and showing him how much he is...