I also agree with Silver Snaffles...one of the greatest horsey books! I also enjoyed the Five Circles...what an amazing book taken from the horses point of view! Thats a book that everyone needs to read...even as an adult!
I also had all of the Saddle Club books...classics...
I read all of them! I loooved Thoroughbred, Saddle Club and Riding Academy. I also read The Black Stallion series, Pony Tails and Pony Pals. All so good! :)
Black Beauty was my first, and will remain my favourite, but I also cherished a series about a girl called Jinny and her spirited arabian mare Shanti, written by Patricia Leitch: http://patricialeitch.ponymadbooklovers.co.uk/
I also read all the horse series books. have you read any of the Canterwoodcrest books by Jessica Burkhart??It is a fun and exciting series Book 4 just came out.The author just visited Angelea from HorseGirlTv and will be on one of her internet segments.
I always loved the Heartland series, and they made a t.v. series out of that too! :D I have read some Phantom Stallion also, but I only liked those books for their cover art. : P