Dance as a Major is indeed a thing. There are some Universities that indeed offers a Degree/Major in Dance. There are also prestigious schools that offers full courses in Dance like The Julliard and Royal Ballet School. Usually when you are a Dance Major, you will be studying techniques like in Ballet, Jazz and other Genres. Academically, you will also study History of dance and even Kinesiology. It even involves theories and applications of Stage production, Choreography and such.