The regular USPS employee knows who's a risk after about one day on the job.
They had the original dog stories ~ the dog that bit the tire while the vehicle was in motion and got stuck spinning round and round as the vehicle went on down the road, or the dogs that lie in wait UNDER the carrier vehicle then leap out just as he gets back from delivering the mail (on a park and loop).
There are no end to the stories about bad dogs, and good dogs gone bad, when you get a bunch of carriers together.
Then people wonder why their dogs front teeth got busted out ~ until they get the bill from the post office.
Bwahahahahahaha!