As dogs get older, their fur may gray. They become less mobile, and their senses are less acute. These are changes that naturally occur with age, in dogs as well as humans. However, if you’ve noticed that your senior dog seems to be confused, is acting distant, or has a dramatically altered personality, another issue may be afoot. Whether referred to as dementia or canine cognitive dysfunction, physical and chemical changes in the brain are the cause. The result is a deterioration of your beloved pet’s ability to think, learn and remember.