When you're looking into buying a doggie door, then you want some peace of mind at home - dogs can be demanding. The door-mounted type is by far the most known kind of dog. When buying, consider the materials used for the flaps, whether some weather sealing is available, extensions for the tunnel, sizes (as some are designed for only small dogs), how easy the installation is, and whether you want an always open or automatic door. Dog doors can also be locked, so your pets won't be able to get out at night.
Although pet doors can be easily installed on any kind of door, not every home owner welcomes this. Sometimes, it's a shame to saw through a beautiful door. Installing a patio dog door facing the wind might be a bad idea, in case you live in areas where there are particularly strong winds. This could also be a potential heat loss source. That's why there are wall-mounted dog door for your convenience.
You want to install your wall-mounted pet door in an area of your house where the dog is least likely to bump into or knock over anything. This is important so that the dog doesn't injure itself.
With a properly mounted doggie door, owners no longer have to get up from what they're doing to attend to their dogs who want to get out of the house. The dog will be able to do this on its own - get in and out as it pleases - and you won't be resenting the dog for interrupting you.
Many dog owners agree that having doggie doors make for a healthier dog. Not all dog owners have enough time to consistently play with their pets. Your pet would love it if it can roam around your home as it likes. When you keep your dog inside the house for some time, that cabin fever might create problems. Dogs that are not socialized properly might get too excited when they sense other dogs, ending up in scratched furniture or knocked over lamps and other breakable items.
Sometimes you may need to spend some time away from your house - a vacation, a visit to another country, a sabbatical - and whoever will babysit your dog might not understand the nuances in its behaviour the way you can. This might stress your dog out. A reliable and easy to install doggie door can solve these problems.

