The sad fact is that as our dogs live longer due to better care, many of them will experience CCD - Canine Cognitive Dysfunction. Our 14-y.o. Barney had this, and we were helped a lot by the book "Remember Me?" by Eileen Anderson http://bit.ly/RememberMeBook Lots of greyt suggestions, from food, to medication, to household changes - all to accommodate their changing situation. It's heartbreaking, but you can do some things to make it easier on both of you. Best of luck.