This is very Similar to Alzheimer’s disease in humans,Canine Cognitive Dysfunction is caused by physical changes in the brain and in its chemicals.
The results of the changes is how your dog thinks and learns begins to deteriorate which then causes behavioral changes that can upset your dog.
Your dog may show theses signs:
Looking lost in familiar places around the home and garden
Having trouble finding and going through doors and stairs
Not responding to their name or any familiar commands they are used to
Becoming withdrawn and not wanting to play or go for walks or even wanting go outside
Not recognizing family members, toys, etc.
Regular trembling or shaking while standing or lying down
Frequent soiling in the house, regardless of the amount of times they are brought outside
Sleeping more in the daytime and less during the night
Staring at walls and into space and can be startled by lights and the tv etc.and wanting less fuss
If your older dog shows any of these signs seek the advice of your vet.