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Orthus is a two headed monster dog and the brother of Cerberus. He appears in The Battle of the Labyrinth under the ownership of Eurytion.

Percy Jackson and the Olympians

The Battle of the Labyrinth

Orthus had reformed along with Geryon. Although his official master is Geryon, he tends to listen more to Eurytion as he takes care of him, unlike Geryon. Similar to the ancient myths (Hercules), Percy Jackson, came to the ranch and killed Geryon, but unlike Hercules, he spared Orthus as he did not participate in defending his master because Eurytion had told him to stay back during the fight between Percy and Geryon.

Geryon

Geryon, Orthus' official owner.

Monsters
Species: Centaur | Cyclopes | Dragon | Drakon | Empousa | Fire-Breathing Horse | Giants | Gorgon | Harpy | Hyperborean Giant | Ichthyocentaur |

Katobleps | Laistrygonian Giant | Lycanthrope | Merpeople | Nikai | Nymphs | Pegasus | Satyr | Skolopendra | Stymphalian Birds | Telekhine | Blemmyae

Friendly Monsters: Argus | Blackjack | Briares | Chiron | Don | Ella | Festus | Gleeson Hedge | Gray |Grover Underwood | Hippocampus | Mellie | Mrs. O'Leary | Ophiotaurus | Peleus | Scipio | Tyson | Tempest
Enemy Monsters: Agrius and Oreius | Arachne | Basilisk | Charybdis and Scylla | Chimera | Chrysaor | Clazmonian Sow | Colchis Bull | Echidna | Euryale | Geryon | Joe Bob | Kampê | | Nanette | Manticore | Medusa | Minotaur | Nemean Lion | Polyphemus | Sphinx | Stheno | Typhon | Scythian Dracanae
Neutral Monsters: Carnivorous Sheep | Cerberus | Erymanthian Boar | Gray Sisters | Gorgons | Furies | Flesh-Eating Horse | Gryphon | Siren