Dog Breaks in to house

[jiena_drakon]

I have a german shepherd just turned a year old. Got her when she was 8 months old. I have never left her alone for more than 3 hours at a time in the house and now my job is requiring me to be away for 5-7 hours. My dog didn't take this kindly and started chewing up my furniture so I tried everything and now just gave up and decided when no one was home she was going to be locked in the back yard out of the house.

I have the dog door in the side of my house where she can get in but it came with a cover that locks in place to keep her out... but she managed to get it off and get into the house..

any suggestions on keeping her out of the house other than putting her into a outside kennel.