Oh dear-I've got 2 dogs and they are very prey driven so have to be watched until they get used to new arrivals. I say this as I don't want you to despair at the dog's behaviour as things can improve as things go on.
That said as to your problem I don't see you can do anymore than you are doing if you have no vet to advise you and if, as you think ,it has a punctured lung there wouldn't be anything they could do anyway.
Keep it warm, in the quiet and just keep your fingers crossed.
Where did these come from I know you had problems with incubation?
GOOD LUCK! Let us know