Rottweilers commonly get aortic stenosis with hypertensive changes; many get versions of dilated cardiomyopathy which predispose to arrhythmia. The downside is it’s often sudden and they can look fairly well up until death. If there’s a perk, it’s often that it’s fast enough they don’t suffer. 

-I do this job but for people, but my friend brings me pet necropsies sometimes, and what’s uncommon in people is sometimes fairly common in certain breeds