"It's important to consider your pet's lifestyle when you establish the layout of your house," Nan Ruvel says. "If your dog goes outside, make sure he can come back in through an area that's super-impervious." She just finished a project in which she converted a breakfast room into a mudroom for a client's two dogs. "She wanted a place where she could get dirt off them before they came in the house," she says. To do this, she put porcelain tile on the walls and floor of the breakfast room, which opened onto the backyard. She replaced the table with a banquette upholstered in stain-resistant fabric and equipped with under-the-seat storage for leashes and food. Nan also installed built-in shelves on the walls where the client could keep towels used to wipe the dirt off the dogs when they came inside from the yard.