When we first met Luna she literally chose us as a family. we had planned on reserving a puppy from the next litter but there was not so much to do when Luna came and didn't want to leave our side. 

When we left, she started to howl and after some discussion, we arranged to take an earlier vacation from work and picked Luna up 2 days after. 

And that is how Luna is - when she wants something, she makes sure she gets it her way.