The aim of the study is to evaluate the effectiveness of AAT on the well-being of patients with Alzheimer disease (AD) at the stage of Major Neuro Cognitive Disorder (NCD) at short and medium term (before care, during care (at the beginning and end of each session), 1 week after, 2 weeks and 1 month after the last session) compared to a group receiving the same stimulation without the dog's response.