we don't start housebreaking puppies for several reasons.
First, most of the time the pups are too young to be housebroken.
Second, there are three housebreaking systems used.
2, newspaper/wee wee pads
if we started one system it limits their ability of fitting into a home that wants to use another system. a pup can't switch in mid-training. once fully trained in one they can switch but it may take some pups 6 months to a year to become fully training to the first.
so it is better to let the new owner choose and start what system that fits their lifestyle