A dog's behaviour can depend on a number of factors, including, its age, breed, past experiences and personality.
It is important to train your dog from an early age to help prevent unwanted behaviour. Training a dog using rewards is one such way. Also giving it praise when it responds to correction or switches from problem behaviour should also help encourage it to behave appropriately. It is important never to punish your dog. This can result in a nervous and frightened dog. Ways to Improve your Dog's Behaviour