The FCI published on its website a report on BOAS (Brachycephalic Breeds and Brachycephalic Obstructive Airway Syndrome) and more precisely a "Report, Strategy and Recommendations" by the FCI Scientific Commission dd. 15.07.2020. Although the Rottweiler is NOT a Brachycephalic breed, the problem of BOAS has entered the breed. This realisation led to an adaption of the breedstandard that now holds the definition of the minimal ratio between skull and muzzle as a breed specific trait but that is doubtless also meant to prevent BOAS from entering the breed even more.
The Commission's recommendations are important for us all and emphasize once again the need for prior testing of all breeding dogs on their comformation but also on their physical and genetic health, including the need to avoid breeding with dogs that suffer BOAS. The full text - a recommented literature for all breed clubs, judges and breeders - is available under this link.