If a dog’s normal behavior changes and there is no specific physical cause, he may suffer from Canine Cognitive Dysfunction Syndrome (CDS). Over 50 percent of dogs over the age of eight have CDS to some degree. Symptoms include frequent “accidents” in the house, obvious confusion (such as not recognizing friends, ignoring you when you call his name, etc.), or a significant change in sleeping patterns. A veterinarian may be able to recommend certain ways to help your dog through this time, but if your senior dog suffers from this syndrome, one of the best things you can do for him is to show him unfailing love and support.