Most of my life I jogged to keep in shape I've had all kinds of dogs come after me never once got biten. The dogs and I both had fun. Now that I am retired I run a little lawn service to keep busy, again I get to meet all kinds of dogs most of which don't like me since I am on there property. But that does not stop me from doing my job. Never got seriously bitten and never had to seriously hit the dog either. Pick up a stick and most dogs will beat a hasty retreat. I firm "Get outta here" in a loud voice works too. Even a good "Boo" with arms raised stops a good dog dead in it's tracks. 99.9% percent of the dogs one meets want to be good dogs and liked my their human "friends" to bad the reverse is not true.
Like I said, I didn’t make the policy that I have to follow.
Most utility companies (contractors included) have the same sort of policy to a degree.
In some cases, the homeowners call in every month with what their meter readings are due to their dogs.