Dogs may become so anxious that they tear up objects indiscriminately, defecate or urinate without control. If a dog is punished for these actions, the resulting increase in anxiety can make the whole situation worse. It is best just to ignore the destruction if at all possible. In order to treat the disorder, it is necessary to set aside some time to figure out exactly what is happening and to help your dog adjust to separation. The first thing you need to do is spy on your dog to figure out how long he or she waits before tearing up stuff in your absence.
Some dogs literally start in one minute or less.
Others wait a half hour or an hour or whatever. Once you have an idea of this you can work on the problem. Talk to your vet about this. Don't stay away long enough for your dog to get upset. The idea is to lengthen the time gradually.