We do not recommend leaving the SwiftPaws set up outside when not in use. While it is designed to use outdoors, the main drive unit housing is not waterproof and should not left outside particularly in the rain. The same goes for the remote controller.
You might decide to leave the course set up and cover the drive unit for an hour or two between sessions. But we still recommend at least bringing the drive unit and controller (the electrical components) inside when not in use, and definitely during inclement weather.
Note: Taking care of your SwiftPaws, keeping it clean and stored out of the elements when not in use will ensure many years of safe, healthy fun for you and your pups!