Whoever thought dog drool, trashed houseplants and assorted canine alimentarymisadventures would sell? When publishers William Morrow released John Grogan’sMarley & Me late last year, they reckoned a print run of 50,000 woulddo for a book about a loveable but utterly rambunctious Labrador retriever.Clearly they underestimated the number of people who would be entertained by theantics of a loving but incorrigible tail chaser, food thief, table sweeper andindiscriminate swallower of toy soldiers, rubber bands, speaker cones, pregnancytest kits and gold chains.