The postal service said employees reported more than 5,200 dog attacks in the last year. WASHINGTON — It’s one of the oldest clichés in the book: dogs hate mail carriers. For thousands of postal workers, dog attacks are no joke. The United States Postal Service has shared the cities and states where mail carriers suffered the most dog bite incidents as Dog Bite Awareness month kicks off next week.  USPS workers reported more than 5,200 dog attacks last year, with Los Angeles topping the list of cities where carriers faced the most incidents. The agency is using the data —…