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I do believe it has something to do with the history of the dog you are not aware of
What I would do is take it very slow.
Do you have a porch or steps in the front?
okay that is where I would start and keep it brief at first , only two to three seconds , in and out, then gradually build up the time from ther
At nine weeks you can still hold him in your arms?
Okay so hold him, step in and out of the door and each time stand a little longer with him.
still on the small side. Think he might have been the runt of the litter, which may be why he was abandoned
Keep a hot dog in one hand fairly secure so that he can only get in nibbles so he begins to associate going out that door means something special
ok...sounds like a plan.
You are welcome.
Is there anything else I can help you with today?
nope...all good thank you