Room Z5 IS empty except for afaux-suede floor pillow,a 14-inch flatscreen TV, an IP network camera, and a 9-pound miniature pinscher sitting motionless by the steel door. After a few minutes, the pooch gets up, walks across the room, and settles on the pillow, almost covering the white letters that spell out w-a-g. Kitschy dance music wafts in from the hallway. A dog yelps in the background. Wag is a new pet hotel in San Francisco that promises the ultimate in canine luxury. It has an atmospheric-nitration system that recycles the facility's air 10 times per hour.
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