The answer to this riddle is Mary Had a Little Lamb. The nursery rhyme tells the story of Mary, who took her pet lamb to school with her one day. The other children were surprised to see the lamb and the teacher was not pleased, so Mary had to take the lamb back home.
In the nursery rhyme "Mary Had a Little Lamb," Mary is the one who went to school with a lamb. The story goes that the lamb followed Mary to school one day and caused a bit of a commotion. Despite the disruption, the lamb was loved by all and even helped Mary with her lessons.
Mary had a little lamb, and according to the nursery rhyme, "Mary had a little lamb, its fleece was white as snow; And everywhere that Mary went, the lamb was sure to go." The rhyme implies that Mary went to school, and the lamb followed her.