The first occasion was when I came to visit with my dog. That was several years ago but she still snarls at me when I arrive at the door.
The second unforgivable offense is when I came to stay for an extended visit and the beloved mistress disappeared for a few nights returning with (hiss) a newborn baby! Of course she blamed me for the arrival of the baby. Hadn't I been the person who brought a dog? It's only logical that I am to blame for all insulting new disruptions to her household.