How do I stop my dog's separation anxiety and pacing?

Ever since moving into our new house 2 years ago, our dog has become a barker when we leave. We solved that with a bark collar, but now he gets all worked up while we are gone and paces from front door to back door leaving a path of drool all over the floor and windows, and he is ruining our carpet which is only 6... show more Ever since moving into our new house 2 years ago, our dog has become a barker when we leave. We solved that with a bark collar, but now he gets all worked up while we are gone and paces from front door to back door leaving a path of drool all over the floor and windows, and he is ruining our carpet which is only 6 months old, leaving a path that is worn down....what do I do to stop the pacing that is ruining the carpet?
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