So Greyhounds Do Bark

We picked up Lucy on Thursday and all was quiet until Saturday night. She had barely made a peep. A little whimper now and then when Steph would leave the room but nothing of substance. Then it happened , Saturday night at midnight we awoke to a deep, bellowing WOOF WOOF WOOF. We still have no idea what she was barking at but wow did it wake us out of a dead sleep.