Who threw ribbons?

The Third Commandment of Animalism states clearly that "No animal shall wear clothes." These include ribbons, which are regarded as a symbol of the animals' previous subordination to the hated human oppressor. The ribbons had been used to decorate the horses' mane and tails, to make them look more presentable on market day.
The new restriction proves very upsetting for Mollie, the not-very-bright-white mare, who loves to wear ribbons as she thinks they make her look rather pretty. But Snowball's having none of it. Ribbons are a badge of slavery and so must be destroyed along with all the other symbols of human oppression. So Snowball throws all the horses' ribbons onto a large fire, much to poor Mollie's distress. Indeed, so upset is she by the burning of the ribbons that she takes off during the Battle of the Cowshed and escapes to another farm, where she can spend the rest of her days showing off her pretty colored ribbons and munching happily on sugar cubes.