At first I didn't know what to tell you but then I put myself in your situation and thought about what I'd do with Samantha, and the answer came pretty quickly.

Based on what you told us, your father loves her and takes excellent care of her. She is well kept, well fed, well loved, allowed in and out - what more could you want? I would leave her with your dad. I'm sorry, I know that's probably not what you want to hear. Unless the only other option was for her to go into a kennel, I would never put Samantha into a situation where she was made to stay outside - ever - muchless after she got used to the comfort of being inside too.

You can still visit her and I'm sure your dad says you can come over anytime, right? And Niki's happy there, right? And your dad doesn't mind taking care of her, right? It sounds like a great situation, aside from you not being able to be with her 24/7, so I'd leave well enough alone.