We finally got around to giving purpose to the exterior door in the kitchen by adding a small stairway and deck to allow access from the kitchen into our fenced-in backyard. This means not having to let our 3 B's out down through the basement into the backyard since we became B owners 3 years ago. I've talked with my wife about adding a doggie door to the exterior kitchen door as a convenience for both humans and the B's.
However, she's expressed concerns about how a doggie door might condition our B's to not retain the learning of "holding it" over an extended period of time. She also pointed out that an "unlocked" doggie door would not be a good idea if no one was home.
I personally like the idea of the B's having the freedom to come and go as they please, just as people generally can use the bathroom when they want/need to. I also think the access would actually improve upon the sporadic housebreaking accidents/revenge dumps that one or both of our male B's experience. I do understand the concern about access to the yard when no one's home.
We need to hear what other B owners have experienced in using doggie doors…for both better or worse.