Because if it works once*, it'll work thirteen more times.
From PW:
HarperCollins Children’s Books has acquired world rights to 13 children’s books featuring the Labrador John Grogan wrote about in his bestselling memoir, Marley & Me.
I'm sorry, but gag me.
And also, BO-RING.
_______________________________________________________________
*My mistake. Apparently, there are already two Marley picture books in addition to the middle grade adaptation of the adult memoir.