Nothing stalls the progression of time better than exercise. Regardless of your pet's current physical status, daily walks or play can rewind years' worth of damage and boost your pet's mental and physical health. For dogs, a brisk 20-to-30 minute walk once or twice a day is just what this doctor orders. For cats, interactive toys such as feather dancers, laser lights or remote controlled toys can get even the laziest cat on its feet. Whatever activities you choose, just do it-doctor's orders.