Four Ponies Frederick Muller, 1958, illus Susan Pares
The three Merrow sisters spend their days longing for ponies of their own. Despite having little money, they eventually acquire ponies for themselves and their youngest sisters and then have some up and down experiences.
Bibliography - pony books only
Pony Magazine, May 1959, illus Susan Pares (extract or abridgement from Four Ponies)