International symposium entitled "Meet cognitive decline in dogs and cats - from basic research to diagnosis and therapy", was held at the Catholic University, Faculty of Theology, in Košice, on October 6, 2015. The invitation to the symposium was accepted by the world leaders, such as: Gary Langsberg BSc, DVM, MRCVS, DACVB, dip ECAWBM, Sagi Denenberg DVM, MRCVS, DACVB, Dip ECAWBM, MACVSc ( Behaviour), Joseph Araujo, MS, PhD, Eniko Kubinyi, MS, PhD. Organizing parties: University of Veterinary Medicine Pharmacy in Košice, Department of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Institute of Neurobiology, Slovak Academy viedvied, Kosice, Slovak Society for Neuroscience, SAV, Chamber of Veterinary Surgeons, the Slovak Association of Small Animal Veterinary.