Dogs play together in a play room at a PetSmart PetsHotel and Doggie Day Camp in Los Angeles, California, May 14, 2012. Not only are top U.S. retailers trying out new ways to make their stores more inviting, some are even expanding, betting there is still a lot of life left in good ol' bricks and mortar. PetSmart Inc, for instance, will offer overnight dog accommodations at more stores to lure customers as it expands. Photo taken May 14, 2012. REUTERS/David McNew (UNITED STATES - Tags: ANIMALS SOCIETY BUSINESS)