We got Shelby when Jake was 14 months old. I was so concerned we would "ruin" Jake. He was our spoiled only boy....but it all worked out fabulously. He and Shelby have never been snuggle buddies but they get along great and enjoy being with each other. We enjoyed the two so much.....that we just recently added our 3rd and he's only added to the joy in our house. Again, the concern with disrupting the balance. And, again, no problems. Took Shelby a while to warm up to him but they all 3 have a blast together and love to play.
Loving mom to Jake, Shelby and Micah