Pomeranians wouldn't be good for you as they can easily break their legs by just jumping off a couch.

I too would suggest a Collie (as in rough collie) or Sheltie, which is in looks and part of the personality a miniature collie.

They are very intelligent, loyal and agile. They love running and playing, catching bubbles and whatnot

I have not seen many klee kai in the UK, but I do love love the Euraiser. Those dogs are gorgeous!