How To Calm Down A Dog?
If your dog is acting out of hand with its built-up energy or is in an anxious or stressed mood, give him time out. Time out is an essential training tool because it separates the dog from things such as human contact, toys, and even the accidental look you can't help but give when they bark to get attention all of which could reinforce undesirable behavior, being in a hyped-up mood in this case. This teaches a dog that acting out is not okay and being calm is a better way to ask for help with the issue they're having. Time out also helps your dog resolve some of their anxiety by removing them from distractions. You can then take your dog to a walk or get other forms of exercise such as fetching.
If your dog is not up for playing, put on some calming music and prepare a scent they're comfortable with such as the familiar smell of a scented candle, essential oils, or some air freshener. Snuggle your dog on the couch or on your bed to soothe them. Contact is a powerful way to relieve stress and anxiety.