Training is an important part of any dog's life, and is important for several reasons. It provides mental stimulation which helps to keep your dog happy, and if combined with morning exercise your dog will be mentally and physically tired at the end and far more likely to sleep during the day.
Dogs are social animals and without proper training, they will behave like animals. They will soil your house, destroy your belongings, bark excessively, dig holes in your yard, fight other dogs and even bite you. Nearly all behaviour problems are perfectly normal canine activities that occur at the wrong time or place or are directed at the wrong thing. For example, the dog will eliminate on the carpet instead of outside; the dog will bark all night long instead of just when a stranger is prowling around outside; or the dog will chew furniture instead of his own toys. The key to preventing or treating behaviour problems is learning to teach the dog to redirect his natural behaviour to outlets that are acceptable in the domestic setting.