07/22/2011 AT 06:00 AM EDT
Horrible Bosses star Jason Bateman
made a mid-day run to Petco in Beverly Hills for a few bags of dog treats. The actor kept a low-key demeanor, with his head down and sunglasses on as he inspected his purchase while waiting in a very long line. "Few people noticed him," says an onlooker, "but mostly because everyone was paying attention to a puppy at the back of the line."