I loved the movie a lot, but nothing can compare to the book. There are so many more funny stories to tell about this wacky dog, and the book just leaves it up to your imagination how Marley gets into all his funny antics. It focuses less on the owners, John and Jenny Grogan's lives, and more on stories of their wild pet.
Even though Marley may seem like a dumb goofball of a dog - he eats anything and everything, he won't listen to simple commands like sit and come, thunderstorms freak him out, he's full of ecstatic energy no matter what the situation - there are times where he seems to know exactly what is happening and what is needed from him at the moment. Like when the Grogans bring home their first baby, Marley knows that he has to be gentle around him.
I got sad when Marley started to show his age. A dog who had acted like an overgrown puppy all his life, and he gets weak hips and a twisted stomach. ~,~ Even though I expected it all along, it was still quite sad.
John Grogan is a really good writer. Of course, he works as a columnist, so that must help a lot, but still. Telling all the funny Marley stories in such detail, he made me believe that they were all true (which they were.) I guess watching the movie, I'd be more liable to think that it was just another made-up plot, even though it says "based on a true story." Anyway, top marks. I highly recommend this book and it's movie to animal lovers everywhere. Here's a trailer for it.