I really like small dogs, but some small/medium dogs have caught my attention... but I do not know much about their activity level/personalities. Some of these are
Shelties (MIL has one, and they are gorgeous!)
Cavalier King Charles Spaniels
Maltese
Springer Spaniels
Pomeranians
These are all based on looks... so of course I wouldn't ever adopt one without doing the research
However, I do not think I will be adding to my pack for about 15 or so years. I'm happy with where we are right now