Hang on, doggy (1977)

This film takes place in Ljubljana, the capital of Slovenia. Matic lives in a large neighborhood of concrete blocks of flats with his mother. As his father is temporarily working in Libya, they live alone. Matics' otherwise monotonous life changes dramatically when he is chosen to feature in a film. At the shooting he meets Milena, a girl his own age whom he begins to like. When the shooting is over, the film company gives him a present, a huge black Newfoundlander. Although his mother is not really pleased about it, Matic brings the dog home. And that is just the beginning of their adventures...