First of all to calm your dog down, do not yell at your dog. If you yell at your dog, he will just bark back, i recommendgiving your dog a treat. After you give your dog a treat, take out another treat, and make your dog wait for the treat. Then, after he has waited for a minute or so, he should be calm. If this does not work, just take him for a walk, or just make him get tired, this always works for my dog. Remember, your dog is not a machine, do not force him to do something that is too much pressure