Simpson’s dog doors are made with heavy-duty aluminum frames and shatter-resistant K9 composite saloon-style panels. Each panel features high-density industrial weatherseal to help mitigate air conditioning and heat loss. To accommodate pooches of all sizes, Simpson’s latest offering is available in three sizes, including medium (up to 40 pounds), large (up to 100 pounds) and XL (up to 220 pounds). Customers can choose from three finishes, including white, silver and bronze, ensuring the dog door can visually match other elements in the room, such as hardware and appliances. For peace of mind, every dog door comes standard with a lock, key and 20-gauge steel plate.