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Is he a small dog? Some smaller breeds get seperation anxiety from being away from their people.
How old is he again? He could be teething which is causing him to want to chew everything he sees.
That spray that someone else mentioned works really well - at least it did with Violet when she was a lot smaller. The one I used was called Bitter Apple. It doesn't smell bad to humans, but most dogs don't like it. I would spray it on my socks because Violet used to want to chew my feet when I was sitting on the sofa. Some breeds (like golden retrievers for example) LOVE that Bitter Apple stuff, so just use it with caution.
I would also recommend obedience class. Violet went to puppy school and she learned the basic commands, but usually the dog trainers will also help you with other problems one-on-one if you have questions (like excessive barking, chewing, digging, etc.). It's good to go through the basic stuff because your dogs learn to listen to you.
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