Nothing relieves a rough day at work to come home & my girl's at the back door, wagging her tail so hard her whole body is involved.
Or when my roommate's home, hears my car, and lets her out the back door and she's jumping at the back fence.
I know a few people who work at small workplaces that allow dogs, and I envy them. I brought Riley in once (which was against the rules), she was well-received but the facilities manager showed up about 10:30 and told me (reluctantly, it seemed) that I had to take her home.