Max is a four-time champion boxer show dog that is Brian's competition in "Boy (Dog) Meets Girl (Dog)".
When Brian meets Ellie during a visit to the vets they connect, but his physical impulses are rejected as he finds that Ellie is under contract to breed with the winner of a dog show. Enlisting Stewie's help, he enters the competition and wins, but is unable to perform when he finds out that it will be in front of the entire audience so the honor is given to Max, the runner-up.