Source: C. Beata, E. Beaumont-Graff, C. Diaz, M. Marion, N. Massal, N. Marlois, G. Muller, C. Lefranc (2007). "Effects of Alpha-Casozepine (Zylkene) versus Selegiline Hydrochloride (Selgian, Anipryl) on Anxiety Disorders in Dogs," Journal of Veterinary Behavior, Vol. 2, 175-183 Description: Repeated measures at 5 time points of emotional distress (low scores are better) of dogs receining zylkene. Variables/Columns dog id 7-8 time 24 emotional distress score 31-32