Multiple of them can be found through Frozen Eleum Loyce.
They behave much like Stray Hounds.
These ice hounds are no trouble on their own but in numbers they can cause a problem. Their attacks alone deal a considerable amount of damage however they lack multiple attacks, simply strafing to the side can avoid the lunge bites that these hounds execute. Using powerful AoE attacks can quickly deal with them as they don't boast a considerable amount of health.