Wolf

Wolves are normally large dog-like animals that serve Lupa, the leader of the wolves and Camp Jupiter. Wolves are social predators that live in families or packs. Genetic studies reaffirm that the gray wolf is the ancestor of the domestic dog. In areas where human cultures and wolves both occur, wolves frequently feature in the folklore and mythology of those cultures, both positively and negatively.

The Lost Hero
In The Lost Hero, Jason has a dream where he stood in Redwood Forest, and a pack of wolves circled around him while the ruins of a stone mansion arose. The wolves eventually led him to Lupa, who gave him hints to his past and made a joke that hinted about his identity.

Later on in the book, a group of lycanthropes attacked Jason, Leo, Piper, and Coach Hedge. They were led by Lycaon, the first werewolf, and according to him they are the enemies of Lupa and her pack. The Hunters of Artemis scared them off or killed them with silver arrows, silver being the only thing that can kill them.

The remaining lycanthropes appeared at the Wolf House and fought with other monsters against the demigods were defeated, and then were brought back to life by Porphyrion. They were killed or scared off when Hera went into her Divine Form.

It is also shown that the Hunters of Artemis have their own pack of wolves that they use for hunting and tracking. It also appears they have some level of communication with them, most likely from being a hunter.