The Oreck Magnesium Upright LW100 and Soniclean Soft Combo Carpet Vacuum are excellent vacuums for shag carpets, according to Prime Reviews. These lightweight vacuums clean effectively and do not get tangled in the long carpet fibers.
The Oreck Magnesium Upright LW100 weighs seven pounds and has a four-inch furniture clearance. It features a tough magnesium frame and has settings for many types of flooring.
The Soniclean Soft Combo Carpet Vacuum weighs 10 pounds. This powerful machine uses suction and brush agitation to remove dirt trapped deep within the carpet. It also comes with a crevice attachment, upholstery brush and hand steamer.