dog has developed chewing habits - only when we're home

[cmsteele]

My boyfriend and I recently adopted a 9-month old corgi cross from an animal shelter. When she first came, it was like she didn't know how to play. We gave her toys and she would just stare at them. It took a few weeks, but she has now become a playful puppy and loves her toys. She didn't chew anything she wasn't supposed to, and was fine to be left to run around when we weren't home. Over the past couple of weeks, however she has begun chewing things around our home. It started with socks and now she's chewed two jackets, the handstrap on our camcorder, and strings from hoodies. The strange thing is that this only happens when we're at home - she doesn't touch a thing when we're out of the house. We're not really sure where we're going wrong here... We live at my boyfriend's work and I'm finishing my degree through correspondance, so we're home with her all the time. We cuddle and play with her constantly, but it seems that the second our backs are turned (to shower, nap, etc.) she finds something to chew. We've tried buying her lots of toys and giving her chew sticks. Also, I take her out for a run or to the dog park for an hour a day which completely wears her out. I've tried putting her on time outs when she chews something she shouldn't. None of this seems to make a difference, and it seems to be getting worse. Any advice?