My dog is chewing all our shoes!!?

I have an 8 month old Lab/German Shepard mix, Roxy. Right now Roxy is not alone for more than 3 hours, but during the day when my husband is home, he is asleep because he has a night job. When I am home from work at night Roxy goes to bed when I do. She has plenty of toys and rawhides to chew on but she recently started chewing up our shoes and has ruined 4 pairs! We moved them into a closet but how can we deter this behavior in the future and keep her from chewing on other things??