Shiro

One of the four wild bearwolf monsters that live in the forest. After being doused in Lloyd's magic power he transforms into a white, fluffy form, earning him the name "Shiro." With a keen sense of smell and a massive body, he can transport Lloyd and Sylpha around with ease.

(Source: I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability Official Site)