Dementia affects dogs as well as people, and although it goes by a different name, it's no less devastating for owners of beloved pets. Known as cognitive dysfunction syndrome or canine cognitive dysfunction, it's thought to affect up to 60 percent of pooches above the age of 11. Distinguishing cognitive dysfunction syndrome (CDS) from normal aging can be difficult. Signs can include changes in a dog's sleeping patterns and social behavior, as well as confusion or getting lost in familiar