A dog that’s spinning in circles, jumping up and down, or barking and yipping is not a happy dog. These are all signs of over-excitement. The dog has excess energy, and the only way her brain knows how to deal with it is to work it off physically. Unfortunately, people often interpret these signs as happiness. Many also tend to think that it’s cute when a dog acts like this, and wind up unknowingly encouraging the behavior. Curb your dog’s excitement and you’ll be preventing misbehaviors in the future, including aggression. An excited dog is not happy. A calm dog is.