A Type D personality is distressed, Type D's have a negative outlook towards life and are pessimistic. A small event that is not even noticed by type B can ruin type D's day. Type D personalities are more subject to depression than other personality types.
For most of human history, horses were seen as prey to be hunted for sustenance. During the late Pleistocene, around 55,000 years ago, Neanderthals scavenged off of horse carcasses and made occasional kills of their own.
Can horses eat meat is a keyword phrase I sometimes see in my Google Analytics. A few years ago, I reviewed a book called Deadly Equines, The Shocking True Story of Meat-Eating & Murderous Horses by CuChullaine O'Reilly. I found the book a little silly, and the supporting evidence that horses can be vicious carnivores a little thin.