Destructive chewing (dogs) (Nothing else worked)

If you tried everything that you could do in order to teach your dog not to chew on things in your house and nothing worked, then you should talk to a professional in this area, a dog behaviorist (behaviour consultant).

The reason why other methods might not have worked is because the problem may be a serious one, like severe separation anxiety, so only a professional in this area can give you the right answers after meeting your dog.

Here you can read more about dog behaviorists and how to find the right one.

Separation anxiety is a real problem that many dogs face, and it's important that you differentiate between bad behaviour and separation anxiety.

Your dog might have separation anxiety if he does the following things:

• Barks and chews on furniture and your personal items when left alone
• Scratches the doors, walls and/or windows when left alone
• Gets overly excited when you come home
• Follows you everywhere while you're home

Here you can read more about separation anxiety and how to deal with it. 

If nothing else worked, then some health condition may be the reason why your dog can't stop chewing on anything and everything. Take him to the vet to make sure that your dog doesn't have some health issue that's causing him to chew destructively.