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In order for your Great Dane to be friendly and happy, he needs to meet other animals and people. This means you need to take him to communal places, such as dog parks, rides in the car, neighborhood walks, pet stores, or obedience classes. Your Great Dane craves human companionship, so make sure he has plenty of interaction with you and your family. Your Great Dane needs to be exercised every day. This will help keep him healthy and happy, but make sure the exercise isn't too strenuous. You should not use your Great Dane as a running partner or do other really intense exercise because it can cause injury to his skeletal system. He can run and play, but not for long periods of time. You should not do any harsh running or strenuous play for long periods of time when he is younger than 18 months. At this point, his body is still growing, which means too much strenuous exercise can put too much strain on his growing bones and cause malformations. Make sure to wait at least an hour after he eats to for exercise. This will help prevent bloat. Although your Great Dane is large, he is fine living inside with you and your family. He will be happy being near you curled up on a bed every day, as long as you exercise him enough. His bed should be cushy enough to keep him from rubbing against the floor, which can cause joint damage. Keeping your Great Dane inside will also allow you to provide him with enough love and affection, which is essential for this breed. He will act out if he doesn't receive enough love and affection. Your Great Dane can live outside, but you have to make sure you spend enough time with him outside or he will act out.
Socialize him. Exercise your dog. Provide comfortable living arrangements.