I was just approved for the town home I was looking at, which is pet friendly.

After I get my nest set up, I would like to get a pet and am on the fence with cat or dog. I am not really sure and would like to know any recommendations for dogs living in a small/two story home. What experiences have you had? I have had cats in the past which have been amazing. I think I would like to step in to the world of dogs though right now. What are the ups and downs?