Hello. My first post here and this thread caught my eye. I have a two year old tabby named "Veronica". Since she was just shy of a year old she would growl whenever someone knocked on my front door. A real deep kitty growl and ears flattened to her head (I call her the little flathead ) I do not know if she is scared or being protective of her brothers and sisters, or being protective of myself. It is funny though, other than that she is a purr box. I guess dogs aren't the only ones who dislike the mailman!!