The Mayor and Common Council do hereby find, determine, and declare that the City has become so closely built up with buildings occupied by human beings for business and dwelling purposes, and has become so thickly populated that the keeping therein of noisy animals has become injurious to health, offensive to the senses, and an obstruction to the free use of property so as to interfere with the comfortable enjoyment of life and property by the entire community and neighborhood, and by a considerable number of persons therein.