Almost 53% of dogs in the United States are overweight or obese, according to surveys conducted by the Association for Pet Obesity Prevention. Approximately 25% of overweight dogs develop serious joint complications. And extra weight places extra demands on virtually all organs of the body. This leads to heart disease and increased blood pressure, difficulty breathing, decreased stamina, heart intolerance, decreased liver function, increased surgical and anesthetic risk, reproductive issues, digestive problems, decreased immune function, skin/fur coat problems, increased risk of cancer, and a decreased quality and length of life. Humans are the main cause of dog obesity. Ultimately, you (the "owner") are responsible for your dog's wellbeing. But this isn't a guilt trip. We get it, life happens. Sometimes you're swamped with work, family, obligations, and the like. Perhaps the weather is rotten -- blistering hot or freezing cold. No living thing should endure prolonged exposure to extreme weather environments. And when faced with such obstacles, taking a walk around the neighborhood or wrestling in the park isn't necessarily doable. So then what? If only you had a tool, a seemingly ordinary item that possessed the capability of giving your pet unlimited exercise time. And if only that item was portable and capable of going anywhere. Ahem. Use this dynamic, portable tool for casual playing & introductory training Use this dynamic, portable tool for casual playing, exercise, and introductory training. It is perfect for obstacle courses, specific training exercises, playing chase, playing fetch, hide-and-seek, and a great many other favorites. Protect from Weather Be advised that this item is only meant for casual use only, not serious training and competitions. Moreover, the material is not weather resistant. We do not recommend leaving the tunnel fully extended overnight or over several days.