u/Notsurewhattoput756

I have had a rescue dog for approx 48hrs now, and he has peed only once. When he did, there was nothing to indicate a medical issue (auto-mod requested I edit out why). As a result, I think this is a stress-based reaction and he is holding his pee as a result. I feel horribly for him! I do understand he's still decompressing, but holding his pee for so long must be terribly uncomfortable. He's clearly quite anxious, as he pants and pants and is scared of pretty much everything.

What can I do to help this dog relax enough for normal urination?