Twice a week, Elizabeth Morosani gets up before 7 a.m., puts on her sun sleeves and spends the next three hours atop a John Deere lawn mower. Her side hustle requires it: She’s converted 11 acres of her land, split between three properties around Asheville, North Carolina, into private dog parks. She rents out the spaces to local pet owners on an Airbnb-style platform called Sniffspot.