There are several things you can do to keep your asthma symptoms under control. One of them is limiting your exposure to certain allergens. If you are allergic to pet dander, keep pets outdoors or avoid getting new pets. Clean your furniture and carpets regularly to reduce the amount of dander in your home. You should also take steps to reduce the number of dust mites in your home. These steps include washing your linens regularly, using a dehumidifier, removing carpets from sleeping areas, and using dust-proof covers on your pillows. Avoid cigarette smoke, strong perfumes, and other irritants. Doing so can reduce the number or severity of the attacks you experience.