I never greet the dogs when I get home and Luke goes and lies down in his bed when I get home. and waits till I call him then he will come quietly and sing for me.. I don't know if that means that he is tellin me of for leaving him or what.. I always thought it was cute but I am starting to wonder what it means..
Often the things we think are cute with our dogs is often not so good..
I'll google the stuff you mentioned and see if that helps.
But I still think that I need to leave him with a foster if only three months so I can save up the money to buy a crate and all the things I need a good crate over here is like 800 bucks and I don't have that kind of money... But I will fight this and try to get it to work, before I totally let him go.

You can get crates on ebay and they are only like 90 usd for a 42" crate. I'm sure they ship would wide. Something to check on. A crate is a great tool and I really think it will help.
Take care!