Audience: Dog owners who have used Rover.com in the past, introducing them to Rover Now: Rover’s new on-demand dog walking service. Subject line: Rover Now walks save your busy day Audience: Dog owners who regularly use Rover.com services. Subject line: Free dog walks for your friends and family Audience: Dog owners who have a Rover.com profile who recently moved to an area where Rover Now on-demand dog walking is available. (Rover Now was not available where they lived previously.) Subject line: Housewarming gift from Rover: FREE dog walks!