Originally Posted by Nigel
Take him to the the vet, could be many different causes, leg/shoulder, might of damaged teeth due to the face plant, might even be something unrelated to the trip incident, best to take him to the vet and get him checked out.
Nigel is right.
I read your post as saying that you're just about to go to the vet.
If what you meant was that you're thinking about it, definitely go.