In the past it was a given the dog became a family pet when the shift was over, that was also the days of german shepherds
imported mostly from Germany being the universal choice for police K9's, today the malinois and dutch shepherd have almost
caught up and even gained ground making it about a 60/40 split favoring the mal/dutchie which aren't nearly as good in the
house as the old GSD was.
So in response, the euro GSD police dog kennels have tailored their breeding programs for a much higher drive GSD that
doesn't give up much to a mal in the work, that results in a dog that also isn't very good in the house for the same reasons.
Aside from the dog aspect, there's the training aspect, it's becoming more and more accepted that the police dog should be
kept in his kennel when not working, the opinion being it keeps the dog clearer and more focused knowing that when he gets
taken out and loaded up, it's work time.
At the end of the day it still comes down to the dog's personality and the skill of the handler, that will determine what works best.