A: Your puppy’s behavior, especially if he seems hyperactive, is the product of breed, age, environment, and individual personality. Some dog breeds are noted for their calmness and others for their high energy. Be sure to investigate prior to acquiring your puppy. Most healthy puppies are very active unless they are asleep. Social maturity may come with physical maturity, but some breeds (especially sporting and larger dogs) may appear to be adults and behave like puppies for a long time after. Neutering your pet will not “calm him down”, but maturity will.