On the continent , you must report it and in some countries get a tracker out to find it and kill it. Unfortuntaely, they may look uninjured but if are hit in their jaw or legs, can basically starve to death.
It is good practice, that if you know whose land it is to inform them, as there might be a stalker nearby who could find it.
the British Deer Society are loooking to set up a register of people who can track deer , and that only has to be good for the welfare of the animals.
Not soppy, just caring