The last one is so that the dog's can look out. I have a friend that did this for her dog. Hers looks a lot better, and her door has square glass panels. It is a doggy trend.
SW-User
@Fungirlmmm a square window wouldn’t look so bad. ☺️
I like the last one. Not necessarily for the dog but just a different look. Put another window on top so you can see out. (Half circle of course)@Fungirlmmm