Horse & Pony Books:
A HORSE CALLED ELVIS
(SCHOLASTIC PB [AUSTRALIA] 2004)
SUMMARY: (From the blurb) "Things hang around in your head for years, like old photographs in an album. Or old books in a box. Faces and feelings gather dust at the back of your mind and you seem to forget about them. But you don't.
The album falls open one day - or you come upon a box - and it's all there again, crisp and clear. I'm going through things I don't use any more, boxes of old toys and books. A photograph album. There's a photo of me and a gangly foal only a few weeks old, his eyes startled and red from the flash. Who is he, this horse called Elvis? The simple answer is that he's just a six year old liver chestnut that I've grown up with. But there is another answer, one that includes Nick, Jaz, Mum and Dad. And me."
Although this can be found in Australia, it appears to be very rare elsewhere and can be expensive.