My husband works for a power company. This is the giant tub of dog treats kept in the back of the office. Servicemen, meter readers, and linemen (anyone who may need to enter customers' yards with no notice) fill their pockets before heading out for the day. Those with experience say it helps a lot in avoiding dog bites, but not in eliminating them. I was told that the meter readers still get bitten "a lot".
But, my husband says, you have to understand that most of my co-workers have a rural upbringing. They have certain views on dogs and dog ownership. One of the meter readers would probably be disappointed if she entered someone's yard uninvited and their dog didn't try to bite her. That's what a dog's supposed to do in that situation.