what was the name of a weekly reader book form '70s about a boy and a striped horse?

Question

It was a book for ages 4-8 maybe. The horse was all different colrs of stripes. I think the boy's name was Alexander.

Answer 1

Alexander
Harold Littledale
illustrated by Tom Vroman
Parents Magazine Press, 1964
out-of-print

http://loganberrybooks.com/solved-alexander-pmp.jpg

This looks like the one