This is puzzling. Robot dogs have more potential, and German sheppards and Dobermans have good mix of agility speed and strength as it is. Would take about 10 years to get 5 generations of supremacy. An army takes an army of trainers.
I get that the goal is genetic engineering rather than breeding. But getting dogs to make 8 babies per year is orders of magnitude cheaper than test tubes and incubators at volume.