In a perfect world, everything needs to have a status of the blue-collar in order to execute some of the relatively heavy work. These humanoid robots must wear a head of livestock animals, so it would be possible to, by means of differentiation, develop a perfect segmentation of ranks. In fact, if you are rich, it is possible to get installed a humanoid head. The most important is that these workers are not able to afford and efficiently maintain a high-quality head even if they work for the hundreds of centuries. Therefore, these dog-headed robots cannot expect to be promoted into the world of humanoids.
To insure an effective production, these dog-headed robots are allocated into different areas and have to wear specific uniforms. Their bodies operate in the same manner and always repeat the same movements. This is their life-long work. Their operations and work environment do not change. If you ask me ‘when are they allowed to stop,’ I actually do not know either. Body parts of the dog-headed robots are relatively simple; therefore, the chance of error and failure is very small.