Watch Movies2Watch. BOS means Best Opposite Sex or the best representative of the opposite sex in the language of cynologists or felinologists. Most often BOS become female animals, as males are Best of Breed (BOB). The characters of the film are women. When Rasa's family broke up, cows and dogs became the way of life. When Vaiva's body "disintegrated", the hobby cats remained. Only Vaiva's hands and feet became her husband Konstantin. Dissimilar stories of two similar women with children, cows, dogs, and cats.