Valerian is herbal sedative and is one of the most well-known herbal remedies used for anxiety, depression, stress and insomnia in humans. It comes in tea or in capsule form, and works to help calm and naturally sedate a dog.

It's commonly believed that dogs wag their tails to convey that they are happy and friendly, but this isn't exactly true. Dogs do use their tails to communicate, though a wagging tail doesn't always mean, "Come pet me!" Dogs have a kind of language that's based on the position and motion of their tails.