I recently tried to show some freedom to my dog and he took advantage of it and started chewing through the sheet rock in my bedroom. now the solution was simple and that I had to start crate training again before he chews through the walls. now, why would the dog display this kind of destructive behavior?
now, he gets tons of exercise... mornings = 40 minutes, lunch = 10 minutes (i work 5 minutes walking from home), afternoon/evenings 1 hour, and late night 10-15 minutes.
p.s. he also has a ton of toys laying around for him to play with