Why Possess Dana and Tully Though?
What exactly was the point of the demon dogs possessing Dana and Tully? I've seen the movie numerous times over the years, one of the best movies of the 80's as far as I'm concerned. But I'm not sure why this possession takes place, the demon dogs possess the both of them, they really don't need to take a human form since they do nothing, and then during the final scene they turn back into dogs.
It gives the two actors some fun things to do, but in terms of the story itself what was the purpose?