I totally relate with what you are going through...except my Rufus is 11 months old!! He does not bite (unless it's play biting); but he does NOT listen and he chews everything...
I have tried training classes to learn things to say to get him to stop (ie: leave it, wrong...) DID NOT WORK
I have tried shaking the can, spraying him, yelling, I even saved a noise maker from New Years Eve for the noise. All of those worked for a short while.
Now I'm still dealing with accidents in the crate at night and still in the house!
Anyways...here is my one piece of advice (I got it from some fellow yorkie owners on Yorkie talk)- Buy a "bully stick". I just got one for him to chew...He LOVES it! He is occupied forever and he even loves it more than his toys. He chews things less (I can actually leave my slippers around without him chewing them). He is really attached to me, and now I can actually do a few things in the house without him flipping out. I can't believe I just heard about these now! You can buy them at the pet store (I bought the natural cow ones-cause he has a sensitive stomach). The person at the store said one stick would last for a while; but he goes through them fast...i usually take it away when it's toward the end of the stick (a few inches) so he does not choke or anything, and I DO NOT give it to him when i'm gone or at bedtime in the crate (I don't want him to get sick of it).
Good Luck
