What tool did the Mudi rely on heavily, unlike the Border Collie's specialized use of the "eye"?

Answer

Its bark

The Mudi's ancestral role on Hungarian farms required them to rely heavily on their bark for herding and alerting, contrasting with breeds like the Border Collie that perfected the use of the intense 'eye' technique.

What tool did the Mudi rely on heavily, unlike the Border Collie's specialized use of the "eye"?
DogbarkSoundbreedMudi