My 5 year old Lab X has recently started chewing holes in the walls when we are gone. What can I do?

Hi Ed,

I've searched your website looking for some help. I have a rather unusual problem. I have a 5 year old black lab mix (I think she is part pit bull but she is mostly black lab.) She has recently begun chewing on my walls. Yup, chewing holes in the walls. She only does it when I am not at home and I don't know how to correct this behavioral problem. I've tried getting up early to take her for walks in the morning before I leave for work, and leaving toys and treats for her. My neighbor comes over once a day to check on her and let her out, and she still is chewing holes in the walls. It's been about once a week for the past two months. What should I do? Any help would be greatly appreciated!!!

Thanks!

Charlie