Set in the eastern suburbs of Melbourne, MUTT follows Odette Harker as she comes to terms with her first pregnancy. She had a rough upbringing, and she now looks to her conservative in-laws for guidance on parenting. But when a robbery occurs at the family’s building company, the couple’s dog Barney goes missing as well. Dog fighting is prominent in the area, so Odette secretly goes against the families wishes, to infiltrate the dangerous underground world to save her dog from a torturous death.

A mother's love for her son is tested by his increasingly alarming behaviour.