I have a 12 yr. old GSD that also has signs of dementia or what is called Cognitive dysfunction. A supplement that includes choline and lecithin is recommended. Also Vitamin E, omega 3, astragalus, alfalfa, ginko baloba, gotu kola, coenzyme Q10 are some others. But before you use any supplement on Rocco, I would suggest you see a holistic vet to get the correct combination & dosages of each for Rocco. It's particularly important to get input from a vet since Rocco has other medical condition & is taking medications.