Blagnac 's Mark Cavendish claims fourth win of this day 's Tour . Franck Schleck Bradley Wiggins maintains overall lead . `` The result of the counter test was positive , but for me nothing changes , '' he said in a statement . Dog on the course cause four -bike crash . Team Sky 's announces failed ' B ' sample , pleads innocence .
Blagnac 's Mark Cavendish claims fourth win of this day 's Tour . Franck Schleck Bradley Wiggins maintains overall lead . Dog on the course cause four -bike crash . Team Sky 's announces failed ' B ' sample , pleads innocence .