ElleVet Sciences Calm & Comfort CBD + CBDA chews for dogs are for pet owners to use when their dogs need fast relief in short-term stress situations such as loud noises from fireworks or weather, veterinary visits, grooming or other similar stress-causing events. With a cannabinoid concentration of 46 milligrams per chew, Calm & Comfort is designed for situational use and provides support as soon as 45 minutes.