Sometimes a bond forms between two friends that’s so strong that it can seem like destiny. Did we mention that the two friends in this case are dogs? “CBS Sunday Morning” correspondent Martha Teichner joins guest host John McCaa to tell the story of her beloved bull terriers, and how rescuing them has brought her joy and a deeper understanding of what it means to love. Her book is called “When Harry Met Minnie: A True Story of Love and Friendship.”