Yes I have a dog flap for my 2 dogs. It's a "Plexidor XL", which is a quality door with a metal frame.Not cheap ( approx £350 ). I confess, although installed ready for use I havn't actually used it yet as I need to sort out a little more fencing in order to prevent them from having complete freedom to great anyone/everyone approaching my front door - suprisingly there are a few ( only a few ) humans who might want to deliver something to me & do not wish to be licked to death in the process ! CiCoch's posting made me laugh "..isn't that called a door" ! Not far wrong, mine is fitted into my door & occupies 75% of the original door, so why not just leave the door open in the first place.? I did ponder that one myself, but when it rains your carpet gets soaked, whereas the dog door closes immediately ( it's double saloon type doors rather than a flap ). I had a previous normal size dog flap for my previous collie cross dog, which I purchased when he got old & needed to go to the toilet more often/during the night - it was brilliant, & improved matters for both my collie & myself. I got the new dog door to enable my deerhound Amy plus Charlie to chase the wild rabbits without waiting for me to open the door - by which time the rabbit tends to be miles away. The opening in the XL Plexidoor is approx 60cm x 40cm (24" x 16" ).
Go for it !