K9 Select Melatonin Beef Flavor Calming Dog Supplement is paww-fect to promote relaxation, calm, and comfort. Melatonin supports overall health by promoting normal thirst and urination. And daily use promotes normal skin and coat health. But most importantly, melatonin acts as a signal that it’s time to sleep. However, with age, natural production decreases which is why it’s difficult for your old yeller to get the same quality of sleep as a young pup. That’s why these supplements provide melatonin—to support quality sleep!