<human>: Can you condense the text into a few key points?

So I have a 7 year old St. Bernard.  Yesterday I found him in his shed whimpering.  i tried calling him out to see if there was anything wrong but he didn't budge.  I tried kind of nudging him by the collar to see if I could get him to stand up.  He looked like he was getting ready to try, but never actually did.

I had to pick him up (not easy for a St. Bernard) and carry him in to the garage.  I live in Idaho, so it's been pretty cold and rainy lately, wanted to make sure he stayed dry and warm.

Anyway, I started poking around to see where he might be hurting, and he didn't seem to flinch to anyway I poked at him.  So nothing seemed to be sore to the touch, but he's definitely hurting.

This was all last night.  I swung by on my lunch break and he was pretty much where I'd left him, so I called and made an appointment with the Vet.  Problem was I couldn't get in until about 24 hours from now.

So the hip dysplasia thing is my own (very) amateur opinion.  I did some reading online, and that's just how it sounds.  So my question is:  What kinds of things can I do to help him over the next 24 hours?  He's hurting in there, and the vet only told me to "Limit Exercise."
<bot>: My dude is in pain, couldn't see the vet for 24 hours, I think it's his hips... What can I do to help him the next 24 hours?