In an industry plagued with what the American Trucking Association estimates as a 50,000-and-growing driver shortage, and a whopping 95 percent annual churn rate among major carriers, trucking companies are doing whatever they can to recruit and retain a workforce, reports the Corridor Business Journal. For some truckers, that means bringing pets along for the ride. At least 60 carriers nationwide allow one dog to ride on long-haul runs, and some companies allow cats or even iguanas and snakes.