There are also plenty of Facebook groups on wolf dogs that could phenotype your boy for wolf content, although if he appears mostly Shepherd then he is probably at most a low content wolfdog, which is easier as a pet anyway. He sounds lovely. A good group that could give you an accurate pheno would be wolfdog education for beginners.
Skadi, AKA Lady Wolfington, GSD 4.6.12
Grim, AKA Bones , GSD 7.7.13