possibly some Husky. For fun you can do an Embark DNA test, I did it with my rescue and was surprised she was
100% GSD. I also suspected Husky mixed in due to her hyperness. Besides the dna test, for a few extra $$ you can get the medical tests done and they test for 180 different conditions. It's good to know for their future, what they might be susceptible to .
Beautiful dog you have there.