28 Feb 2019 --- Nestlé Purina has launched a new line of supplements aimed at improving anxious behaviors in dogs by ameliorating their digestive issues. The Purina Pro Plan Veterinary Supplements Calming Care range contains the bifidobacterium longum (BL999) probiotic strain, which Nestlé Purina researchers found to be beneficial for canine gut health. “While anxious behaviors are often thought of as psychological, their effect on a dog’s physiologic state is real,” notes Nestlé Purina Research Scientist Dr. McGowan.