Red Siberian Kai - レッドシベリアン・改

Great Red Siberian is a monster of the beast species and is the Demon King's faithful dog. Great Red Siberian values discipline and wants Princess Syalis to act like the hostage she is. He has served the Demon King for a long time and enforces the Demon Castle rules through his troops of Red Siberians. (Source: Sleepy Princess Wiki)