Beaphar Herbal Calming Collar for Dogs contains the natural herb valerian, which is known for its calming properties such as visits to the vet or kennel fireworks, thunderstorms, travelling in the car or moving house. It effectively reduces problem behaviour, such as excessive barking, destructive behaviour, inappropriate urine marking in the home, and boisterous behaviour.Once fitted, the collar works quickly and will be effective within one hour; it will help dogs feel calm, settled and relaxed for up to six weeks.Suitable for all breeds of dog.