Reasons for excessive chewing?

[jazzy]

I have a 5 month old Shiba Inu puppy, male.

Jack has always been a bit of a chewer. When I first got him, he chewed on things for attention. I stopped that with a gentle 'no' then spraying the object with bitter spray. The chewing stopped for about a week.

Then he started teething. He would pick an object to gnaw on...such as my end table. When I sprayed the object with the bitter spray, he'd just chew any way. Maybe he tongue wasn't making contact with the spray? He stopped chewing for a little bit.

Now he's being flat out destructive. He just destroyed my brand new bath rug in about 30 seconds. He's destroyed a purse. He grabs onto mouths full of carpet and won't let go. He tore a comforter because he grabbed, pulled, and refused to let go.

Why? And how do I stop it?

When I see him chewing the carpet or blankets, or anything else, I say 'stop' sometimes 'aaay!' if I'm angry. When I saw the destroyed rug (I went into the other room for just a few seconds) I immediately took it away and yelled 'no' and 'bad!'

I know I should have one command or correction instead of using so many (no, ay, stop, bad). But it's kind of hard when you're possessions are being eaten to think of the proper command. Is there one command that's 'best'?

How should I treat him afterward? Sometimes ignoring him works. Sometimes if I ignore him he'll lay quietly and play like a good pup. But other times he takes it to mean that I'm not paying attention and proceed to eat other things, or go right back to chewing carpet.