1930s, race horse, jockey and location all unknown.
Next c1910, a farm boy and his working horse.
A pony called Janet and a girl called Helen, late 1920s.
The girls are Juliet and Helen, the year is 1928, but the donkey's name is not written on the album page.
Donkeys at Clovelly, Devon (I think that is the location) in the 1920s.