When you choose a reputable breeder you can be sure that he or she would not leave anything to chance. They would have certainly selected the right dam and sire with some special and fully thought out reasons. The reasons could be quite a few. It could be the breed of the dogs.
There is no doubt that the breed of the dog has a specific role to play when you are deciding to make a selection. It defines the look of the dog, the skin color, texture, the behaviors, the food habits and other such attributes.