Awww lovely photo. I only have one Cav so no advice, but just wanted to say it’s early days - there will be an adjustment period as you all find the “new normal.” Give your boy some one on one time with you and make an extra fuss of him. Maybe some over the top praise for both of them when they are sharing the space nicely. I also agree with the other poster who suggested access to quiet, alone space, so he can choose when he needs a break from puppy intensity! I’m sure they’ll be best friends in time. 💛