Cão de Castro Laboreiros have a very distinctive bark: highly resonant, generally starting with low tones and ending in a long high pitch, rather like screeching.
About the Cao de Castro Laboreiro
Cão de Castro Laboreiros are mastiff–type lupoid dogs characterised by an almost rectangular body. They are vigorous animals of pleasant overall appearance, sometimes with a rather striking colour. Their gait is free, easy and energetic.
Loyal and docile with people they know, Cão de Castro Laboreiros do a great job protecting livestock from attacks by the many wolves that still prowl the mountains of northern Portugal. They are simply awesome watchdogs, seeming never to switch off even for a moment. These dogs carry themselves nobly but they are hardy mountaineers and that severe expression they wear is fearsome.
Source: key facts and characteristics sourced from Fédération Cynologique Internationale (FCI)