Sooo Sandor is a Goblin charged to protect Sophie. He has a squeaky rabbit/chipmunk esque voice that does not fit his physical appearance.  Try that voice however you may... He is very protective of Sophie and takes his role very seriously. Dislikes separating from Sophie very much. Ironically it happens a lot.

Here's an example of what I'd like him to sound like (it's probably better if you have a program that modifies your voice to be squeaky)-

https://www.youtube.com/watch?v=s6OlCKwm2Tg 

The dog pack leader  from Up. I was talking about Sandor with my friend, and he compared him to this dog, and I was like that is the *perfect* comparison. So if you can, I think Sandor would have more of that type of voice, except he's good.