Looks like somebody tried to make a pet of it.
Im sure thats what happened.
We put blaze orange zip up hunting hoodies meant for people on our St Bernards and great danes so that the brown or white didnt get someone hosing bullets at anything that moved. After people started saying that our newf looked like a bear we started putting an orange vest on him too. Those dogs are gone but we met so many trigger happy city loons that now we put a blinking orange collar on our Great Pyranees during hunting season.
A deer raised by people from a fawn wouldnt struggle or be stressed any more than a dog would.
It probably is a free ranging pet. In the 1960s it was pretty common, but back then they put collars on them. Many a deer did not get shot because it had a collar on it. Back then a lot of wild animals that were orphaned became free ranging pets, e.g. ran wild but came home almost every night to get food and a safe home. The animals usually became semi-domesticated, e.g. they would let the adoptive family touch and feed, but staid away from everyone else.