Just a quick note about the rottie.
They are often compared to the sharpei, and pit bull, and recognized as a ferocious fighting dog.
It takes very little research to determine the differing origins of the breeds. Rotties were bred from cattle herding dogs. They are shepards at heart.
The genetic tendencies are much different than those of a breed whose ancestors were selected for blood sports for centuries.
They're mastiffs, used for guard work, descended from Roman war dogs. When the Romans left them behind, the Germanic people put them to work pulling carts and guarding cattle.
