It depends on the type of calming product that you’re using. Some supplements and chews can calm your dog within 30 to 60 minutes. A wearable calming product can often have an instant effect on your pet. Music, aromatherapy, and pheromone calming products can often calm your dog within a matter of minutes. However, depending on how severe your dog’s anxiety is, it may take days or even weeks before you get the desired result.