KINGSTON — For Karen Sims, changing professions meant a lifestyle change as well. Sims left the medical profession to become a full-time pet sitter/walker in 2014. She said she’s so busy that she sometimes doesn’t have weekends free. “I get up at 6 a.m. and come home around 9 p.m.,” Sims said during a break on a recent Wednesday. Though she said she’s “always going,” she tries to take a Sunday off to spend time with her family while not disappointing her client base. “I hate to say no,” Sims said, noting there are times when she has to shift her schedule to include everyone who asks for her services.