Come To Grief by Dick Francis

A sick child fighting a losing battle begs Sid's help to discover who mutilated her pony so viciously it had to be destroyed. Sid's heart goes out to the bewildered little girl as other prime colts are attacked in the night.
Sid risks a life-time of friends and his professional reputation to being a killer to justice. He knows the identity of the attacker, but he lacks the proof necessary for a conviction. 


Lots of action, mostly likeable characters but no real explanation of why the villain chose to cut feet off horses.  Not as good as other Dick Francis books.