I called one of my friend who previously work in a vet to help us. He is very good in handling dog even bigger ones like Rotweiler. Surprisingly the dog was very calm and let him carried. However he didn't have the time to follow us to the vet and we have to carry him once we reached. As you can see the video, he was awake after a 30 minutes drive.
We got some X-ray done and he was injured pretty badly. Please click the X-ray photo to full size. The back leg bone were fractured completely and became like crossing each other. It must have been very painful. I have two option here according to the vet, one is amputate and one is fix him. Since he might be back on the street and since he still have a chance to walk with 4 legs, I will go to the fixing option which is putting a pipe inside and join the bone up. I certainly hope that the man has given him shelter will take in him, I just need to talk him again about this.
The dog has to stay in the vet for a month at least and the medical fee will not be cheap. I have to use all Alera fund in this and hopefully I can get some discount from the vet.