Quality cat and dog doors installed with a professional finish into glass, timber and aluminium. If we can't make it look good, we won't do the job! All the cat doors we deal with are 4 way locking - allowing ease of trapping the little monkeys at vet visit time etc! The larger dog doors have a barrier to lock them off when not in use, allowing the dogs to actually SEE they can't get through, when the door is locked off!