“Stray Dogs” begins with a long shot of a mother sitting on the edge of a bed, brushing her hair as she watches her two children (Lee Yi Cheng and his sister Li Yi Chieh) sleep. This woman, presumably the children’s mother, vanishes from the story, and the siblings are next seen living with their dad (Lee Kang-Sheng) inside a shipping container and making pocket money holding up advertising signage at a busy urban intersection. The film continues like that, observing the harshness of the children’s lives, and their father’s exhaustion and seemingly constant depression. – Matt Zoller Seitz