Research crate training. It is basically this: Get a crate just big enough for your dog, but not too big. The dog should just fit inside with the door closed. Feed the dog then put them right in the cage, don't make it negative, just gently put him in. When the dog whimpers, gently take him out and put him straight outside. If he pees/poos, he gets a treat and is aloud back in. If they just stare at you, straight back to the crate. Repeat until they don't need the crate anymore.
If the dog pees or craps in the crate, the crate is too big.
I am sure there are assorted tips and tricks, look them up.
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