An interesting question and I'm not sure how to answer it. Thinking about it she has/had a very vivacious personality so that is outwardly/ As far as a dynamic VF is concerned how does one know? I would say it was someone who gets coughs and cold and the VF throws them off easily and successfully. This used to be her but now the VF is all tied up with the chronic disease and she doesn't get any. I am hoping that by giving a 200 I can shock the VF into working. at least that is my simplistic way of looking at it. I have to admit I know nothing about animals. I pass people with question about animals onto to a local homeopathic vet!!