The history of the Portuguese Sheepdog is indeed surrounded by mystery, and while several theories exist, concrete evidence is lacking. It is widely believed that the breed originated in Portugal likely in the central and southern areas. The Serra de Aires mountainous region has been closely associated with the breed since the early 20th century. Speculation suggests that the Portuguese Sheepdog may have been developed through crossings with other herding breeds present in the region, such as the Pyrenean Shepherd and Catalan Sheepdog. However, there is no solid evidence to support this theory.
One of the more accepted theories is that in the early 20th century, the first Conde de Castro Guimarães, Manuel Ignacio de Castro Guimarães imported Briards from France to help herd his sheep. While the Briards were skilled herders, they struggled with the local Portuguese climate and terrain. To address this, the Conde is said to have crossed the Briards with local herding breeds possibly including the Catalan Sheepdog and Pyrenean Shepherd. This theory is based on circumstantial evidence, including the resemblance between the Portuguese Sheepdog and these other herding breeds.
By the late 1920s, this new breed had gained recognition and popularity in its native region and the adjacent Alentemol region. Fortunately, the breed was not significantly affected by the population declines experienced by other European breeds during the World Wars, as Portugal had limited involvement in WWI and was not involved in WWII. In 1932, the Portuguese Kennel Club officially recognized the Portuguese Sheepdog, establishing a breed standard. However, due to urbanization, limited international recognition, and modern technologies the breed faced a decline in the 1970s and was at risk of extinction.
Beginning in the late 1970s, dedicated breeders and owners formed a group to save and revive the breed. With additional support during the 1980s, the Portuguese Sheepdog was further developed as a companion dog and gained popularity among middle-class Portuguese suburbanites. In 1996, the breed received formal recognition from the FCI (Federation Cynologique Internationale) as a member of the Herding Group. Despite these efforts, the Portuguese Sheepdog remains rare outside Portugal, and within the country, it is primarily kept as a companion. A small number of dogs still actively participate in herding within its native mountainous region.
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