A dog patio door is a dog
door thats mounted within a sliding glass door. The advantage of these type
of dog doors is you don't have to install the dog door through a wall, door
or other barrier. A dog patio door is an insert that is very easy to set up
in the same groove as your sliding patio door. Dog patio doors make great
permanent dog doors but can also be used temporarily since they can be installed
and removed so quickly. Your existing patio sliding door can still be opened
and closed. The disadvantage of a dog patio door is that depending on the
style of sliding doors you have you may not be able to lock them when the
insert is in place.
A photo of a typical dog patio door

As you can see this dog patio door looks very professional and elegantly matches
the existing human door!
Your dog is now able to freely move between the house and the garden to go
to the toilet and enjoy being both outdoors and indoors.