Valerian root has sedative, hypnotic, and relaxing properties to help dogs feel relaxed. The most common use of valerian root for dogs is calming your canine's stress. It's used to combat common fears in dogs, such as loud noises, separation anxiety, and unfamiliar situations. A warming, sedative herb, valerian with a bitter taste, is used to calm the nerves, reduce pain, stimulate the appetite and aid blood pressure, spasms and digestion.