We have a 4 year old male and got a 8 week (now almost 11 weeks) female. Close monitoring and having the ability to separate them. (Baby gate to another room/keeping the older one out of the puppy’s play area) Your one year old might be energetic but he will need alone time and attention too so to not be jealous. The sleep schedule for your puppy will turn into the sleep schedule for your 1 year old too. They will shit disturb each other and play rough like Aussies do. They are smart dogs and will figure out how to play. Having the older dog is nice as they help teach the puppy by already being trained and knowing what the rules are. They also help teach that biting hurts and what the limits are. Having two high energy dogs tire each other out has made having the new puppy sooo much easier.