The Most Horrible Pony (1) (Amy and Clown)

1st in the series. Amy had longed for a classy, well-trained pony who would win her lots of rosettes. But Great Aunt Myrtle bought Clown, a clever pony who is full of horrible tricks. Amy hates him. He bites and bucks and she cannot catch him. Who is Dagmar and where does her finely-bred horse come from? Can Amy and her new pony-mad friends keep the secret of the old falling-down cottage or should someone tell? Trouble all round for Amy.