[ Photo from Sunbrella ]
As someone who lives with two very crazy dogs who both shed like to dig (not to mention shed...a LOT), I can vouch for Sunbrella's outdoor fabric's durability....so much so that I really would consider using their furniture fabrics line for reupholstery. Their furniture fabric line is basically their outdoor line, except there's a wider range of colors, textures, and patterns available. Their site has a pretty nice photo gallery that shows off their fabrics on classic furniture if you want to get an idea of how it would look. Even though the fabric may not be as soft as other fabrics out there, the level of maintenance is so easy.
Anyone have any experience with Sunbrella (or other outdoor fabrics) indoors?