For better or worse, hoarding has gotten a lot of attention in recent years due to the popularity of several TV shows, including “Hoarders” and “Hoarding: Buried Alive.”

The scientific interest in studying canine cognition has led to the development of a slew of test protocols—some uniquely designed for dogs and others modified from the field of comparative psychology.

If you’ve ever gone to sleep with a cat at your feet, there’s a fairly good chance you’ve woken up with your face enveloped by a tummy of fur. Although your bed is large enough to afford the both of you ample resting space, your cat has no doubt shown a preference for setting up camp right on top of your head.