Zeus

Zeus is a male Boxer. He has the usual Boxer markings, and has dark colored eyes. He has a collar on. His ears are cropped to look like horns and his tail is docked to a mere stub.
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 Spoiler Warning 
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== The Storm ==
Zeus is first seen in the park. He is shown to be very good friends with Shep.
Later on, Zeus is seen again as one of the dogs Shep saves. He is proud to see his friend, since he's tired of being around yappers.
Zeus is annoyed with the yappers, so after the Wild Dogs attack, he leaves and asks Shep if he would join him. Shep declines, and Zeus calls him the "King of the Yappers" and leaves.
After Shep kills and defeats Kaz, he questions any dog if they challenge him. And one dog does, and it is Zeus. Before the two friends fight, Shep sees the scar on Zeus's shoulder blades, he remarks that they had hurt him. He then replies that it was their way.
During the fight, a massive waves crashes down. Shep sees Zeus clinging onto the shelves where Shep is standing. He tries to help his friend, but he sees Higgins in the water, and apologizes. He releases him and saves Higgins, with Zeus yelling at him that he knew that he would be the king of the yappers.
== The Pack ==
Zeus kills many dogs in Shep's newly formed pack. Oscar led him there due to frustration because Shep had shut down his club. Honey later dies because of Zeus, and along with other dogs such as Higgins. 
He is later captured by humans, along with Blaze and Callie.
== The Return ==
Zeus returns in the final book of the series after Oscar had made a diversion in order to free the dogs from the airport, Zeus returns with Oscar to Shep whom the entirety of his pack is disgusted with him albeit Oscar stood by his side saying he had changed - eventually nearing the end of the book Shep and his pack-mates are still salty yet have gained trust in him again despite his past.