A good marking dog is worth it's weight in gold, no matter what type of dog. They can come in all shapes and sizes and save hrs of unnecessary netting.
They are all different and mark in different ways also. Some are dead easy to read, others can take time to read.
My beddy/whip is a solid marker, no mistaking, as is my collie, the terrier however is very busy and can often miss, he marks with his head down the hole.
I've seen dogs scratching at entrance, pointing at entrance, subtle looks towards you.
Took a couple pics today while out for a wander (no ferret).
When I have them all out,