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John and Maria's two Great Danes have very different attitudes: Gigi has near perfect behavior while Optimus is far from optimal - leaving the couple wondering where they went wrong in raising the latter. Optimus has bitten John, along with their neighbor and a family friend. Can Cesar transform Optimus' aggressive attitude into that of a more loving dog? Then, Cesar meets Sissy, a shepherd mix who was one of 57 dogs confiscated from a hoarding situation.