http://shadowanimals.homestead.com/Shadow-Animals-Home.html - This page is a collection of stories about shadow animals. Shadow animals are often dark or black in color (though I have reports of white figures as well), constantly seen running, or if sighted move at remarkable speeds. Often, the figures have feline form to them, but can be identified as other animal species. These are not standard animal ghosts, as they often move incredibly fast and leave a sensation of surprise, fear, or shock to those who see them. It's possible a milder manifestation of a shadow person (or in that general category). The site accepts stories and is compiling them, along with ideas as to what these shadow animals might actually be.