rottweiler

The word 'Rottweiler' is an eponym, taken directly from the German city of Rottweil in Baden-Württemberg. The town's name itself has older roots, likely from the Old High German 'rot' (red) and 'wil' (villa, settlement), referring to the red Roman tiles found there. The breed was historically known as the 'Rottweiler Metzgerhund' (Rottweil butchers' dog), as it was used by butchers to herd cattle to market and guard money pouches. Thus, the modern term denotes the specific, powerful working dog that originated from that region.

This is a proper noun derived from a German place name. It is not productively formed from separable English morphemes and is therefore treated as a simplex unit in English.