The way these behaviors often develop is from the natural chewing and mouthing instinct. Keep in mind that dogs don't use their mouths only to eat but also to pick things up, carry them around and generally all things that we do with our hands. They can't pick up a pair of knittting needles or a computer game when they get bored. So if they can't find edible toys to play with they will use whatever they can find. Many people think (rightly so) that cardboard rolls from toilet paper or paper towels make great toys for dogs since they are so easy to replace. From mouthing to eating is not a long way.
I would start by using a crate or exercise pen for confinement (if your dog is confinement trained, otherwise that will have to be done first) and then offer an edible chew treat that takes a while to process. After a while the dog will develop new habits of eating chew treats.
Sometimes a mineral imbalance can cause pica and giving a mineral supplement will help. The best is to get mineral levels checked through a blood test but some vets might recommend an all-purpose mineral supplement for dogs.
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