My first cavalier, Pippin, was such an easy puppy. He was housebroken and knew all his commands by 8 months old. So when he was 10 months old, I asked the same breeder if she had a litter coming and a litter had just been born. Merry came home 2 months later when Pippin was one year old. Pippin took to Merry right away and they have been best friends ever since. I am glad I did it.