To be exact, although it is about Beau, it isn't a memoir. It is more of a brief look back at the author's own life and how the dog played a role in it. You don't get much of a look at his personality, but you do get a good glimpse of hers.
It is a pleasant little story and you can feel the love she and her family had for Beau. If you have 30 minutes and don't mind a couple of tears, read about Ms. Quindlen and her dog. I know I would want everyone to get a glimpse of my pets if they could and I bet that is why she shared her Beau in this story.