Working in IT is a lot like being a doctor where the patients get mad at you for asking them to tell you their symptoms and sometimes the diagnosis is they didn't realize they need to blink once in a while or they forgot how to use one of their arms.
We have no issue leaving her at home alone. She has a spot where she waits, and as soon as we start getting ready to leave, she goes there. Sometimes we come home to find some clothing in the spot with her, but she behaves herself perfectly. We didn't train her to do this. She just does. I read somewhere that, for most dogs, if you are chill about leaving, and if you've developed a relationship where they feel secure and loved, this tends to be how it goes.