While the wheel does provide exercise for your pocket pet, it can also lead to tragedy, especially if the wheel wasn't designed for your type of pet. (animals.mom.me)
Playing with your dog also provides exercise and mental stimulation to help prevent bad behaviors caused by boredom. (littledogtips.com)
Their nose will still work, though and teach them how to track or «find» objects helps to stimulate their mind while providing exercise. (petfriendlyhouse.com)