The United States Post Office has been dealing with dogs and dog bites to its employees since the first “mailman” walked onto a dog owner’s property. Dog bites to mail carriers are an occupational or workrelated  injury. Therefore, the number of dog related-injuries cannot be considered “under-reported” and U.S.P.S. data on the number of mail carrier reporting dog bites is to be considered consistently reliable. Corresponding with other dog bite data from throughout the nation, the number of mail carriers bitten by dogs over the past three decades has significantly decreased:

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Sourced October 2010 https://nationalcanineresearchcouncil.com/wp-content/uploads/2008/10/whatisadogbite1.pdf

Read The DogSmith article on 'What is a dog bite'? and dog aggression facts and fiction