Mother goat tells the children the wolf can be cunning. Kids should be aware her voice is nice and soft and wolf's voice is deep and rough. Her fur is white and his fur is black, so they should notice the difference.
Soon after she leaves THE HOUSE, wolf knocks on the door and wants to enter. Kids don't let him in and tell him his voice is too rough. So he changes his voice and tries again. This time his black paw with claws revealed him.
Wolf gets some flour and knocks again with white paw, similar to their mothers. Kids open the door and he eats them all but the youngest. This kid hides in a grandfather clock and survives the massacre.
Soon after mother returns and discovers open door and the mess in THE HOUSE. Youngest kid tells her what happened and together find a wolf in the neighborhood sleeping with full stomach. Mother goat cuts his belly, gets six kids, who were still alive, out and they load the wolf with stones. When the beast wakes up, feels thirst, goes to the well and the weight of the stones pulls him under the water.