Agreed with a bored dog can be a destructive dog. My 8 month old cocker was quite a bad chewer of anything he could get when I first got him (at about 9 weeks). He has calmed down considerably but every once in awhile he when he is bored (or not mentally stimulated), he tries to go back to his old ways.
I found that plenty of walks, play, and any other means of "burning off his puppy energy" seems to keep his chewing at a minimum.

For those with destructive older dogs, see this thread I made a while back:

http://www.dogsey.com/showthread.php?t=136460

You are definitely not alone!

Well at the moment she currently gets around 20min of training each day. We do recall when out, sit and stay and leave also when on walks. In the house when i leave her i put all the toys in the middle of the floor and usually i dont have problems with her when i do that. As long as there is nothing else she can get her teeth onto.

I dont think its SA as she does it when im in the house as well. She just picks everything up all the time. I try to pick everything up after me all the time but try telling my dad that. Last night i was sitting in bed when she upstairs with the house phone in her mouth. lol. Its funny but its not at the same time.

She does very well with the leave it command. Even when in the house and outside if i tell her to drop it she does instantly.

Oh she also gets walks. Prob about an hour and a half a day if not a bit less atm as my other dog is reovering from surgery. I dont want to over do it as she is still a puppy