Bigger dogs , longer rests , Unharnessing , Smaller teams , less inbreeding. Just a few for starters. 
They are making 35-50 lb dogs do the work that 75 -100lb dogs use to . 
The leaving dogs harnessed 24 hrs a day is bad too. 
Eating and running should br banned also a few hours of rest to digest at least part of the meal  should  be a no  brainer.  Eating and Running only has them pooping and peeing out out solids and liquids rather quickly without having a chance to be digested. 

Food for thought anyway