There is a number of trades that don't exist anymore in our modern world of Europe or Northern America. One of those trades is being a knacker - in Czech pohodný, ras, drnomistr or antoušek, in German Abdecker, Wasenmeister or Kaffiler, in Latin excoriator or canicida. There were many families in Bohemia and Moravia in the past which were in this trade...
"A Dead Horse on a Knacker's Cart", drawing by Thomas Rowlandson (1756–1827).