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My name is ***** ***** I have been a Vet tech for 30+ years.
It is possible a head injury or internal damage. It is hard with a wild animal and he will need attention by a Vet. The big issue is you need to be sure to muzzle him if you try to bring him in. If you have the ability to look for him, he would have a better chance of survival after being hit. In the wild with a head injury or internal bleeding. His chances lessen since he is weakened and vulnerable to defend himself and has a better chance if being attacked by other animals or bleed to death.
You can try calling the wildlife organization in the area. They can set some traps in the area to bring him in or may even have some rescuers to bring him in. The other option is calling a wildlife rescue to see if they can send some people out after him. You did the best you can for him.
Good that is a some help. He is injured he will not go too far.
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