When your dog is aggressive, hyperactive, frightened by loud noises such as fireworks, during thunderstorms or when travelling, or even bored from being left alone, Content-UM will help to calm him. By giving Content-UM regularly, you will find that he becomes a pleasant, social and contented member of the family. Serene-UM relaxes your dog in a totally natural way and is not a sedative. We do advise that it may take a few days for Content-UM to build up in your dog's system and have the required effect.