My dog has randomly formed a habit of eatting random ****?

Sounds like boredom. Exercise him more and get him his own things to chew on. My dog has a basketful of toys and is given bones and chews regularly.

Failure to supervise, allowing this poor behavior, failure to contain when you can't supervise, failure to correct when caught in the act, failure to dog proof your premises, put everything away so it can't access anything and failure to provide sufficient daily exercise, regardless of weather conditions, how you maybe feeling (tired/sick/busy) and other obligations such as school, work, social life, a tired dog is a good dog, this particular breed requires a lot of exercise, note paragraph 3....

http://i40.photobucket.com/albums/e224/GLLNTKNIGHT...

And finally don't reward it for this poor behavior "I gave him food assuming he was hungry" If you're feeding properly on a set schedule, set amount, no free feeding, according to body/condition exercise, he needs nothing else but cool clean water.

Place the food down, pick it up after 5-10 minutes whether he's eaten or not and offer it at the next meal, he should only be fed twice daily12 hours apart.

Dogs need something to chew on, get him something safe.