system
A chat on subreddit /r/NoStupidQuestions
human
Ikr, that's a good freaking dog.  My dogs would bark at best, but more likely just way their tails and hope for snacks as always.
gpt
We had such a good dog when I was a kid, but we definitely thought that she'd probably just make friends if someone ever tried to rob us. 
Turned out we were wrong, but we didn't find out because someone tried to rob us, but because apartment maintenance came to change the doors to the kitchen cupboards.

The dog let them in and was very friendly, but then those dastardly carpenters tried to *steal our cupboard doors*! According to the dog who stood between them and the door, growling and telling them that they were not allowed to leave with our stuff! It was obviously the old cupboard doors they were gonna get rid off, but doggo proved she indeed was the best dog ever. (Don't tell my dog I said that, she's also the best dog ever!) 

Iirc they had to wait for someone in the family to come home and let them out, and as this was in the nineties they couldn't just call. Or maybe they got out but had to leave the old doors behind, I was like 6 so I don't remember the details. 

We found out later that dogs who are trained are supposed to let thieves in but not let them leave, that way it's nice and tidy for the police. Our dog was not trained for security at all, but she had good instincts.