Your dog was born knowing how to become a dog. They begin their socialization with their mother and littered siblings. Continuous socialization with other dogs is necessary to strengthen their knowledge of dog language - how to play, listen to scolding, interpret another dog's mood, etc. The language of the dog can be considered in the same way as the language of man. If you lived in life with no one around you who spoke your language, you would quickly get rusty.
Dogs can teach each other many valuable lessons that they cannot learn from humans. For example, bite inhibition is learned at a very young age. Puppies are born with extremely sharp teeth and yet they constantly put everything around them in their mouths.
Many people work hard to try to alleviate puppy biting play. However, just socializing with other dogs will remedy brutal bites almost immediately. Basically, if they play too hard, they lose their friends. The other dogs will stop playing with them. Since they want to play, they quickly learn to soften their mouths in order to have mates ready to play.
Mad and hyperactive dog, socialization is the key to temper your energy. Older dogs, who are familiar with dog language, will correct it immediately and take it a step further. He will begin to learn to be more aware of his surroundings and respectful of others.
Dogs just need interaction with their own species. They are pack animals. A happy dog is a dog who can have all the canine companionship he desires and who can come home feeling tired, ready to be cuddled with his human family.