The Wolf and the Seven Young Kids

This is a fairytale reported by the Grimm Brothers. It tells of an anthropomorphic mother goat who tells her seven kids to not open the door for the disguised wolf, and tells them how to recognize when it is her and when they can open the door. The wolf of course tries to get the kids to open the door but fails. He goes into town and gets some citizens to fix his tricks. Eventually the wolf manages to trick the kids into opening the door, and eats almost all of them all up, swallowing them whole. One of them remains, and he tells his mother what happened. They then attack the wolf in his sleep, opening up his belly and filling it with rocks, then sewing him back shut. Afterwards when he wakes he goes to drink from the river and falls in and drowns.https://www.grimmstories.com/en/grimm_fairy-tales/the_wolf_and_the_seven_little_goats
== Adaptions ==
There are a couple of Youtube videos telling this story.https://www.youtube.com/watch?v=3ggr0FITapE Many use sheep instead of goats. 
One in particular changes the story. It is titled "My Little Goat" and is Japanese.https://www.youtube.com/watch?v=b3zySRBcYOE The mother brings home a human child in a wool coat to fool her children into thinking that all of her children survived, when in fact one of them was fully digested (or otherwise missing for some other reason). In this way it uses the "wolf in sheep's clothing" reference. It also changes things up so that it becomes a story about sexual assault. The wolf becomes a man, and thus they add in a werewolf one as well. The mother and children in this one all resemble sheep, but she has horns like a goat and the title mentions that they're goats.
Undertale might be based off of this story. Toriel is a goat who watched a total of seven humans who were to get killed by Asgore. Noticeably in the original tale they mention that the goat had paws, which allowed to wolf to trick the kids, by making them appear white. She is also a white goat monster with paws instead of hooves or normal hands. Asgore also had to "get his hands dirty" by killing the children to allow freedom for monster kind. But that may be irrelevant.
== References ==