In the text by A. Tolstoy, some dashes are used. For example, the story ends with "Мышка за кошку,/ Кошка за Жучку,/ ... / Дедка за репку / -– Тянут потянут -– и вытянули репку".
I think the second dash is used to draw attention to their unexpected success (contrary to their former unsuccessful tries). But I have no idea what the first dash is used for.
I hope someone could give an explanation.