 Watson shoots the dog with his revolver.Later, Mrs Toller confirms Holmes' theory about Rucastle's daughter and reveals that when Alice came of age she was to receive an annuity from her late mother's will; Rucastle tried to force his daughter to sign control of the inheritance over to him which only resulted in Alice becoming ill with brain fever; hence, the cut hair.Rucastle then tried to keep Alice away from her fiancé by locking her up in the mystery wing and hiring Miss Hunter to unknowingly impersonate Alice.