@Quercus:
Yep, those are the main reasons that I don't leave mine out when no one is home. Just about a year ago, we had some strong winds (not even a storm) and a tree blew down a panel of our fence. Our dogs probably would have been long gone if they had been out. And we had one dig out (never, ever had dug before) last spring..again, I think she was bored, and decided to try it out…not good if someone isn't there to check frequently.
Again, I am not against doggy doors, it just isn't something I am comfortable with. There are also other reasons that we have that "normal" people don't have (ie lots of bitches that don't get along; revolving different packs out in the yard, etc); so we maintain A LOT of control over who goes out when.
Thanks to everyone so far for all of your responses. The initial responses were overwhelmingly in favor of using doggie doors in some fashion…now I'm seeing responses coming in that point out other issues that need to be considered.
Quercus' points make a lot of sense to me. Where there's no oversight/control of our B's location/status due to no one being home, doggie doors present a degree of risk no matter the location. Of course that risk level varies depending on one's own unique circumstances (i.e, breeder, city or rural, when owner(s) is/are home, proximity to high-traffic areas, wild creature infestation levels, etc)
I see that it's ultimately a 'case-by-case' judgement to decide whether or not to use doggie-doors. If an owner is in favor of using one, the times and situations for it to be used and/or locked need to then be configured for one's own unique home, B's, and schedule characteristics.
My insane fantasy would be to have an internet camera with a sweeping view of the backyard so I could monitor the presence of the B's outside, along with remote/time-controlled doggie door capabilities. A perimeter detection system could be used to detect if any of the B's compromise the perimeter and thus trigger a secondary fence to materialize from the ground. Too bad I would need Bill Gate's kind of money to put something like that in action.