Oh really ?
The only working dogs I've ever seen wearing any kind of neck protection are boar dogs (pits,doggo's, Bull arabs etc) so I take it there are plenty of boar round your way are there?
For earthwork to ANY quarry that collar would be a hindrance if not downright dangerous for the dog and besides which where would you have room for your locator collar?
So again, it's over to you Bradder. Why not thrill us all with the logic behind this gem of hunting wisdom?
Failing that keep digging your hole !
Deeper and deeper still !