From what we discover about circe, we can assume that her tame wolves and mountains lions are

Her tame wolves and mountains lions are "men" transformed into beasts.

Circe is a goddess of enchantment or at times a sprite, witch. Circe was famous for her immense information of elixirs and herbs. Using these and an enchantment wand or staff, she changed her adversaries, or the individuals who insulted her, into wild mammoths. Some say she was ousted to an island of Aeaea by her subjects and her dad Helios for murdering her significant other.