How can I stop my dog from shaking when giving basic commands like 'lie. I am sure it is anxiety/attention

I would ask your vet, for a mild sedative if the dog is in that much distress.

Crate training can be very beneficial for both you and your dog. Crates give your pet a room of their own. Crate training can help to prevent destructive behavior and can be a very effective house-training tool.

Believe it or not, there are beds designed specifically for your problem. There are several beds designed with chew-resistant material. I will post some links here with a variety of products available.

http://www.theuncommondog.com/Categories/Dog-Beds-by-Feature/Chew-Resistant-Dog-Beds.aspx

http://www.mightypets.com/Premier-PetBeds.aspx

http://www.squidoo.com/chew-resistant-dog-beds

Many people are stuck on this part. Your voice has to be very clear and it's easier to keep the same tone if you say "sit down" instead of just "sit". Same goes for lie down too.

I found this on a review of the dog:
Playing with Lucky is pretty simple but does require some learning. Lucky is programmed to respond to 15 different commands but the commands must be issued the same way each time. First, you say Lucky's name to engage him. Once you say "Lucky" (or whatever name you give him) he will then respond to you with 2 barks. After he goes ruff-ruff, then you can tell him what to do. The commands are as follows: 

Speak to Me - he will sit or stand & bark 
Come Here - he will run forward and back 
Pounce - he will crouch and pounce excitedly 
Lay down - he will lay down on his tummy 
Sit - he sits 
Want a Treat? - he stands and barks (begs) 
On your head - He does a headstand 
Go to sleep - lays down, snores and enters sleep mode 
Sing a song - he'll bark one of 2 songs 
Good Dog - acts excited by shuffling his feet 
Bad Dog - he crouches down 
Put 'em up - he'll stand up on his hind legs. Then when you say "bang bang" he plays falls down and plays dead. 
Tug of War - he opens his mouth for you to put in his leash, he closes his mouth and tugs a little 

Lucky also comes with a "sleep" mode and automatically shuts off after not being played with for 3 minutes. 

Playing with Lucky is pretty simple, you command and Lucky performs. Well, Lucky performs most of the time. You need to be sure that he has your attention (barking twice) first before issuing the command. A few of the tricks are a bit more complicated - Put 'em up & Tug of War but the rest are very straight forward. I do notice that both my husband and I had the tendency to want to 'yell' or raise our voices when commanding Lucky - but that isn't necessary.