A közös kutya (1983)

Children, friends and classmates find a dog at a nearby construction site and decide to keep it. But, as they living in a block-of-flat, no one can take the dog home. When they bring him to the school, the gym teacher offers shed to the dog in her garden, if the kids take care of him, feed him, play with him. But it turns out the "common dog" has a legal owner, an old lady who now is lonely, as the dog was her only company. When one of them wants to give the dog back to the owner, the others turns against him.