My pup is 3 and is calm and sleeps a lot, but still has the energy to play and get into trouble. lol
We go to the park in the morning for a walk and play ball a few times a day and she attacks her bear and drags him around the house in the evening to get rid of some of her energy before bedtime. She does sleep a lot during the day and then wakes up eats plays a bit, goes back to sleep and does it all over again.
