first off, I want to reiterate that you should not hit the dog at all no matter how hard or for what reason. It sounds to me as though the dog has been abused in the past and it probably had something to do with a bike. Could be that his previous owner would run into him with a bike, or hit him from the bike, etc. People's cruelty to animals knows no limits and when you have an animal that has been abused, extra TLC must be employed to help the mental wounds heal.
Second, you should NOT send him away AT ALL. Above all, animals - especially rescued animals - need stability. If they keep hopping from place to place they will NEVER feel secure. The dog has no way of knowing he's only being sent away for a month - as far as he's concerned he's being kicked out of your house and is now going to live with someone else. Then a month later he'll think he's being kicked out again.
The dog wants in the closet. Let the dog in the closet and watch what he does. That can provide clues to his behavior. If he runs in and hides in the corner, then he's frightened of something. Animals often look for enclosed spaces when they're scared. Does he have his own bed? Preferably a crate inside the house? If you establish a routine of putting him in a crate every night when it's time for bed, he will eventually come to view the crate as "his" space where he's safe from anything. Any time he's feeling scared he can go to the crate for security.
Of course, it could be as simple as he smells a mouse in the closet, or he's just curious as to what's behind that door. It'd be very interesting to see what he wants in there. Let us know.
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