Do you think he looks full Siberian Husky or a mix? 3 months old.

I recently adopted a rescue dog who is growing like a weed, we have had her 3 weeks, she was at 13 lbs. when we got her, now she is at 20lbs. I was told she was German shepherd which she may be, I'm just curious to what others think? she does look like a shepherd with all of her characteristics...