Just that really. Grew up with dogs, have had cats for the last 19 yrs (the same 2 they were just very long lived)! My ds is an only one, and although I had a sister i was very close to growing up the sense of companionship I had from our family dog was immense and I want this for my son.
We did look into an older rescue dog, but my ds is a little nervous around dogs, and I feel that a puppy coming into the home and 'growing up with him' would probably work better, especially from a pack point of view iyswim.
So, tell me the worst...