Help keep your paw-tner calm and collected with Purina Pro Plan Veterinary Diets Calming Care Probiotic Dog Supplement. This supply of supplements contains a strain of beneficial bacteria known as BL999 that has shown to help keep dogs calm during stressful situations like separation, trips to the vet, thunderstorms and more. Specially formulated by Purina researchers, nutritionists and veterinarians, these dog supplements are not only palatable, but they can even help promote a positive emotional state in dogs, too!