For me it's a huge turn-on if I know that people are watching while I'm being bred by my dog, but it hardly ever happened so far. Being filmed is sort of the same, but you don't hear any comments or other sounds of the audience. So, I'd rather be a "theater" actress than a "movie" actress.
My biggest fantasy is to have a dog's wedding. We set-up a little theater or similar room, with a bunch of chairs for the audience, and a stage. Then, I am lead in from one side, wearing a wedding gown, while a serious dog (german shepherd, rottweiler) is brought in from the other side. Some fake vicar performs the entire wedding ceremony, replacing words like "wife" with "bitch", and some other changes. Then when it's done and he says "you may now fuck the bride", I drop the dress so that I'm naked, get down on all fours, and let the dog take me in front of the audience. Hopefully we'll manage to perform half an hour or so.
This is the first time I've talked about this fantasy, perhaps talking about it can be the first step to make it actually happen...