In order to spot wild as well as cultivated truffled we must always be accompanied and guided by the specificaly trained truffle dogs. 
Dogs of different breeds can be used for this purpose. Of common use are Labrador Retrievers, Griffon Korthals, english Pointers and german shorthaired Pointers (Bracco Tedesco ή Kurzhaar), Lagotto Romagnolos, Epagneul Bretons, Springer Spaniels, Cocker Spaniels.

Every breed has its specific characteristics and the best choice of a truffle dog shall be formed once all the requirements of the potential owner are pointed.
The purely hunting breeds tend to have a wide field of research, strongly developed sense of smell and are generally highly active.  Retrievers tend not to move far from their owner while making an intense and detailed research. Epagneul Bretons and the Springer Spaniels are known for their great strength and stamina as well as their ability to retrieve. The Lagotto Romagnolo is a breed of characteristic obedience and capabilities, bred from italians in order to detect truffles.