Môj pes Killer is a one-day drama portraying eighteen-year-old Marek living near the Slovak-Moravian border with his dad and his racist friends. However, Marek's best true friend is his dog. His life is shaken up when he discovers the secret of his lost mother Marika.

Jaroslav is a handsome and seemingly good-natured son, father and decent husband. But in fact he is pathologically jealous of his wife Blanka and very much afraid that she will leave him one day with their three children. Jaroslav and his family do not hesitate to employ violence, deceit and terror against others, which ultimately leads to a family tragedy.