This breed was most probably developed over several centuries out of the descendants of the so-called “Pfahlbauhund” in Slavonia, Croatia. Professor Stjepan Romić developed the Croatian Shepherd Dog as a breed in the year 1935.
The Croatian Shepherd Dog is believed to have evolved over centuries from the "Pfahlbauhund" lineage found in Slavonia, Croatia.  Professor Stjepan Romić formally recognized this breed in 1935.