Seriously, Suz. If he likes his crate, won't using the crate as a punishment undermine the positive aspects of crate use?
Oh, my... You need to tune in to Cesar Milan - "The Dog Whisperer" - on the National Geographic Channel ASAP! He's new on Fridays, but he's on more often than that.
I'm not sure where you got the idea that you should punish a dog, but punishing a dog is useless. Dogs live in the now. If they are doing something bad
right now you can distract them and redirect them. But they can be standing in the middle of a room full of furniture and electronics torn to shreds, and they
seriously will have
no clue whatsoever as to why it is that you are mad at them. He'll feel bad, but he probably finished tearing up your house hours ago and all he knows is that you come home and yell at him. You can't reason with a dog, you have to give a dog opportunities to behave well. Eventually that habit of behaving well becomes their usual behavior.
If he's in the crate thinking "THIS IS AWSOME!" and not tearing up your house, that is a win/win situation. Give him a chew toy, and make sure that he's been potty before you leave. The crate should not be a punishment, ever. It should be a safe place to be, a comfortable place that he can stay both when he wants to and when you want him to. When I am in the shower getting ready to go somewhere, more often than not, I will find Mandy laying down in her crate ready for me to leave the house when I get out. She's happy there, and I'm happy that I don't have to worry about her tearing up something that she shouldn't.
Your hours away from the dog do seem to be a bit long, but it can be dealt with. Dogs are an awful lot of work, but it can be very rewarding. You have to remember that at his age, he is about as mature as a 9 year old, and you have no real history on him other than what the people you got him from told you. They probably wouldn't have given him away if he wasn't acting like a puppy. You wouldn't let a 9 year old that you didn't know stay alone in your house all day.
Dogs are nocturnal by nature, so he's not going to automatically want to sleep when you do, but he will eventually. We put Mandy's crate in our bedroom at first. She was totally freaked out by the idea that she might have to sleep on a dog bed. She paced the room all night long and kept us awake with her toenails on the floor. We started with the door to the crate closed, then left it open after several nights. After a week or so, she found her place outside the crate on the dog bed and slept through the night. She was 8 or 9 months old when we got her and we had very little history to go on, so we had to do what was safe and comfortable for her.
If someone can come let him out to potty during the lunch hour, that would be great. And he should be getting a walk before or after work.
Good luck with this, and tune in "The Dog Whisperer"! It's all basic stuff that will make you slap your forehead and say "Duh!
I knew that!"