That's definitely a tough one, dappledoxie. Please don't think we would think bad about you over this. You did what was right for her and you at the time, and it seems like your dad was happy to do it.
I do have to agree with everyone in that it would be easiest on Niki to stay with your dad. Change can be pretty hard on dogs, and it certainly seems like your dad adores her! That's a good thing! Has he been paying for vet bills, food etc? If so, then it's even easier to see that it's the best idea to let her stay with him, as he was financially caring for her as well. I know it's tough to make that sort of decision, but I do think it's the right one.

Have you actually spoken with your dad about this? Perhaps he would have some insight. Remember, you can always go and visit her. Good luck and let us know what happens
**hugs**
Karen

edit: sorry Brandy, I think I was posting the same time you did! LOL