BROOK PARK, Ohio — The city’s four-legged residents are in for a splashy celebration when Brook Park’s annual Dog Swim returns Aug. 23. Pups are invited to paddle, play and pose for photos at the city waterpark that day. Running from 11 a.m. to 1 p.m., the event gives dogs exclusive access to the waterpark before it closes for the season. The $10 registration fee per dog includes a …