Tserng is now a Rover.com dog-sitter, taking care of four-legged friends in Seattle on a daily basis. It’s quite the change from her last gig, and not exactly where the 36-year-old expected to be after earning her MD from the Medical College of Ohio nearly a decade ago. ... she and her friend are on pace to make $100,000 per year,... Tserng, who made $40,000 in a training position at her last job as a medical examiner, plans to continue pet sitting for the time being.