When you have a yard for your pets to play in, it is lovely to be able to let them out just to be animals for a bit. A pet door is just about the only way to give them easy access to the great outdoors at all times without having to sit by the door. Unfortunately, many doors are not really conducive to having pet doors - traditional ones, at least - installed. Hale Pet Doors has a fantastic custom pet door that is designed to work in French doors, where a pane of glass is replaced with a barely noticeable flap. Sizes vary, but you can't beat the subtlety of the design. And your pets will be happy, too! Prices range from $115 - $465, depending on model.