My daughter took care of a Rottweiler and a Shitz tzu while a couple was on vacation.
After the introduction and instructions, she asked for a key. They said you won't need a key. We do not lock our doors.
They explained that locking the doors was totally unnecessary.
Their postman delivered their mail to the neighbor across the street.
The Rottweiler enjoyed his back being scratched. He had an annoying habit of heading straight for your junk, then at the last moment ducking and squeezing between you legs for the whole length of his body. You of course complied with his every desire, without question. Happy to be his buddy.
Apparently Belgian Malinois is the new "in" dog.