In “The Puppy Diaries: Raising a Dog Named Scout,” Jill Abramson, a prizewinning investigative reporter and now executive editor of The New York Times, has vanquished the writer’s self-­regarding pose. She plunges into the subject of her dog’s first year and comes up with a golden retriever of a memoir. Unaffected, unironic and lovingly goofy, “The Puppy Diaries” is not for the reader who sees life with a dog as a Booth cartoon. But it should hit the wide, heart-shaped mark cultivated by dog fanciers everywhere unafraid to be heard singing lullabies to the furriest members of the family.