There are 16 species of flies that are interested in truffles eating or laying it eggs. Some flies are interested in immature truffles, some in ripe truffles and others in rotten truffles.
You can then exploit this characteristic to detect the location of truffles.
You have to stand in silence in the woods, hitting the ground from time to time with a stick to fly the insects. Watching the soil, identified the starting point you can dig out the truffle.
The law treats this technique to digging.
This method was used by truffle hunters have not the dog and knew places and truffle beds with the typical circular area without grassy vegetation.
The collection is very laborious and low value.
You can still take advantage of this factor with the truffle collection by dog, using the flies surrounding nearby as “sentinel”.