I got a 2nd dog because, like you, I felt my dog Sam was getting very spoiled, overly dependent on me for 100% of my attention all the time, and he needed a friend. He is still very attached to me, but it's much less neediness now that we have 2. He did get slightly jealous at first.. he would butt in between us if I was giving cuddles to dog #2.. but even that was minor, no aggression issues or fights whatsoever. He was mostly just thrilled to have a friend in the house. The jealousy faded quickly though and they are best buddies.. I love having 2 dogs.. will never be a one dog household again 