#2. Avoid Frustrating your Dog

Nobody likes being teased, especially dogs. Help your dog avoid interacting with things he cannot have. For example, if he gets anxious when he sees people and dogs outside the windows, block his view by shutting the curtains or moving the couch.
Most dogs are frustrated when they are not allowed to meet other dogs they see, including those they must pass on a leash, so when you’re out on a walk, let him interact with other dogs (with permission from the owner) from the safety of a loose leash hold. This way, he can greet other dogs without uncomfortable restraint and carry on his greeting ritual. However, if your dog lunges or barks at other dogs, consider consulting a trainer or behaviorist to evaluate whether your dog has an aggression problem.