Abstract: A pet door cover assembly is described which completely encloses a pet door to seal off drafts and leakage. It employs a cover large enough to cover the entire pet door and frame. It is preferably made of three layers, being a water resistant outer layer, a thermal insulation layer and an aesthetic layer having a pleasing surface or design. The cover is attached to the door or wall using an attachment means. The attachment means may be a hook and loop attachment, magnets and metal plates, elastic material or mechanical screws and hooks. The cover preferably employs a bendable wire, or other deformable means to be able to retain a shape. This is extremely useful in making a seal on non-flat surfaces. The bendable or deformable nature allows the cover to match the contour of the wall or door to create a tight seal.