SONIC® brings back two delicious Pretzel Dogs for a limited time   America's Drive-In Tempts Guests with a Twist to a Classic OKLAHOMA CITY, 2017-Jun-21 — /EPR Retail News/ — SONIC® Drive-In (NASDAQ: SONC) is bringing back a fun twist on everyone's favorite summertime meal by reintroducing two delicious Pretzel Dogs for a limited time. With one bite, fans…